diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index 76b539622..c8ff25548 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -123,25 +123,26 @@ dependencies {
 
 #### Additional dependencies
 
-You may find yourself needing additional functionality and wanting to add more dependencies to your `build.gradle` file. Since extensions are run within the main Tachiyomi app, you can make use of [its dependencies](https://github.com/tachiyomiorg/tachiyomi/blob/master/app/build.gradle).
+You may find yourself needing additional functionality and wanting to add more dependencies to your `build.gradle` file. Since extensions are run within the main Tachiyomi app, you can make use of [its dependencies](https://github.com/tachiyomiorg/tachiyomi/blob/master/app/build.gradle.kts).
 
-For example, an extension that needs Gson could add the following:
+For example, an extension that needs coroutines, it could add the following:
 
 ```gradle
 dependencies {
-    compileOnly 'com.google.code.gson:gson:2.8.2'
+    compileOnly 'org.jetbrains.kotlinx:kotlinx-coroutines-core:1.5.2'
+    compileOnly 'org.jetbrains.kotlinx:kotlinx-coroutines-android:1.5.2'
 }
 ```
 
-(Note that Gson, and several other dependencies, are already exposed to all extensions via `common.gradle`.)
+(Note that several dependencies are already exposed to all extensions via `common-dependencies.gradle`.)
 
 Notice that we're using `compileOnly` instead of `implementation`, since the app already contains it. You could use `implementation` instead for a new dependency, or you prefer not to rely on whatever the main app has at the expense of app size.
 
-Note that using `compileOnly` restricts you to versions that must be compatible with those used in [Tachiyomi v0.8.5+](https://github.com/tachiyomiorg/tachiyomi/blob/82141cec6e612885fef4fa70092e29e99d60adbb/app/build.gradle#L104) for proper backwards compatibility.
+Note that using `compileOnly` restricts you to versions that must be compatible with those used in [Tachiyomi v0.10.12+](https://github.com/tachiyomiorg/tachiyomi/blob/v0.10.12/app/build.gradle.kts) for proper backwards compatibility.
 
 ### Extension main class
 
-The class which is refrenced and defined by `extClass` in `build.gradle`. This class should implement either `SourceFactory` or extend one of the `Source` implementations: `HttpSource` or `ParsedHttpSource`.
+The class which is referenced and defined by `extClass` in `build.gradle`. This class should implement either `SourceFactory` or extend one of the `Source` implementations: `HttpSource` or `ParsedHttpSource`.
 
 | Class | Description |
 | ----- | ----------- |
diff --git a/multisrc/src/main/java/eu/kanade/tachiyomi/multisrc/luscious/Luscious.kt b/multisrc/src/main/java/eu/kanade/tachiyomi/multisrc/luscious/Luscious.kt
index 42755f397..5e802bd29 100644
--- a/multisrc/src/main/java/eu/kanade/tachiyomi/multisrc/luscious/Luscious.kt
+++ b/multisrc/src/main/java/eu/kanade/tachiyomi/multisrc/luscious/Luscious.kt
@@ -5,13 +5,6 @@ import android.content.SharedPreferences
 import androidx.preference.CheckBoxPreference
 import androidx.preference.ListPreference
 import androidx.preference.PreferenceScreen
-import com.github.salomonbrys.kotson.addProperty
-import com.github.salomonbrys.kotson.fromJson
-import com.github.salomonbrys.kotson.get
-import com.github.salomonbrys.kotson.set
-import com.google.gson.Gson
-import com.google.gson.JsonArray
-import com.google.gson.JsonObject
 import eu.kanade.tachiyomi.network.GET
 import eu.kanade.tachiyomi.network.asObservableSuccess
 import eu.kanade.tachiyomi.source.ConfigurableSource
@@ -22,6 +15,20 @@ import eu.kanade.tachiyomi.source.model.Page
 import eu.kanade.tachiyomi.source.model.SChapter
 import eu.kanade.tachiyomi.source.model.SManga
 import eu.kanade.tachiyomi.source.online.HttpSource
+import kotlinx.serialization.decodeFromString
+import kotlinx.serialization.json.Json
+import kotlinx.serialization.json.JsonObject
+import kotlinx.serialization.json.JsonPrimitive
+import kotlinx.serialization.json.boolean
+import kotlinx.serialization.json.buildJsonObject
+import kotlinx.serialization.json.int
+import kotlinx.serialization.json.jsonArray
+import kotlinx.serialization.json.jsonObject
+import kotlinx.serialization.json.jsonPrimitive
+import kotlinx.serialization.json.long
+import kotlinx.serialization.json.put
+import kotlinx.serialization.json.putJsonArray
+import kotlinx.serialization.json.putJsonObject
 import okhttp3.HttpUrl.Companion.toHttpUrlOrNull
 import okhttp3.OkHttpClient
 import okhttp3.Request
@@ -29,6 +36,7 @@ import okhttp3.Response
 import rx.Observable
 import uy.kohesive.injekt.Injekt
 import uy.kohesive.injekt.api.get
+import uy.kohesive.injekt.injectLazy
 import java.util.Calendar
 
 abstract class Luscious(
@@ -44,7 +52,7 @@ abstract class Luscious(
 
     private val apiBaseUrl: String = "$baseUrl/graphql/nobatch/"
 
-    private val gson = Gson()
+    private val json: Json by injectLazy()
 
     override val client: OkHttpClient = network.cloudflareClient
 
@@ -86,90 +94,91 @@ abstract class Luscious(
         val contentTypeFilter = filters.findInstance<ContentTypeSelectFilter>()!!
         val albumSizeFilter = filters.findInstance<AlbumSizeSelectFilter>()!!
         val restrictGenresFilter = filters.findInstance<RestrictGenresSelectFilter>()!!
-        return JsonObject().apply {
-            add(
-                "input",
-                JsonObject().apply {
-                    addProperty("display", sortByFilter.selected)
-                    addProperty("page", page)
-                    add(
-                        "filters",
-                        JsonArray().apply {
+        return buildJsonObject {
+            putJsonObject("input") {
+                put("display", sortByFilter.selected)
+                put("page", page)
+                putJsonArray("filters") {
+                    if (contentTypeFilter.selected != FILTER_VALUE_IGNORE)
+                        add(contentTypeFilter.toJsonObject("content_id"))
 
-                            if (contentTypeFilter.selected != FILTER_VALUE_IGNORE)
-                                add(contentTypeFilter.toJsonObject("content_id"))
+                    if (albumTypeFilter.selected != FILTER_VALUE_IGNORE)
+                        add(albumTypeFilter.toJsonObject("album_type"))
 
-                            if (albumTypeFilter.selected != FILTER_VALUE_IGNORE)
-                                add(albumTypeFilter.toJsonObject("album_type"))
+                    if (selectionFilter.selected != FILTER_VALUE_IGNORE)
+                        add(selectionFilter.toJsonObject("selection"))
 
-                            if (selectionFilter.selected != FILTER_VALUE_IGNORE)
-                                add(selectionFilter.toJsonObject("selection"))
+                    if (albumSizeFilter.selected != FILTER_VALUE_IGNORE)
+                        add(albumSizeFilter.toJsonObject("picture_count_rank"))
 
-                            if (albumSizeFilter.selected != FILTER_VALUE_IGNORE)
-                                add(albumSizeFilter.toJsonObject("picture_count_rank"))
+                    if (restrictGenresFilter.selected != FILTER_VALUE_IGNORE)
+                        add(restrictGenresFilter.toJsonObject("restrict_genres"))
 
-                            if (restrictGenresFilter.selected != FILTER_VALUE_IGNORE)
-                                add(restrictGenresFilter.toJsonObject("restrict_genres"))
-
-                            with(interestsFilter) {
-                                if (this.selected.isEmpty()) {
-                                    throw Exception("Please select an Interest")
-                                }
-                                add(this.toJsonObject("audience_ids"))
-                            }
-
-                            if (lusLang != FILTER_VALUE_IGNORE) {
-                                add(
-                                    languagesFilter.toJsonObject("language_ids").apply {
-                                        set("value", "+$lusLang${get("value").asString}")
-                                    }
-                                )
-                            }
-
-                            if (tagsFilter.state.isNotEmpty()) {
-                                val tags = "+${tagsFilter.state.toLowerCase()}".replace(" ", "_").replace("_,", "+").replace(",_", "+").replace(",", "+").replace("+-", "-").replace("-_", "-").trim()
-                                add(
-                                    JsonObject().apply {
-                                        addProperty("name", "tagged")
-                                        addProperty("value", tags)
-                                    }
-                                )
-                            }
-
-                            if (creatorFilter.state.isNotEmpty()) {
-                                add(
-                                    JsonObject().apply {
-                                        addProperty("name", "created_by_id")
-                                        addProperty("value", creatorFilter.state)
-                                    }
-                                )
-                            }
-
-                            if (favoriteFilter.state.isNotEmpty()) {
-                                add(
-                                    JsonObject().apply {
-                                        addProperty("name", "favorite_by_user_id")
-                                        addProperty("value", favoriteFilter.state)
-                                    }
-                                )
-                            }
-
-                            if (genreFilter.anyNotIgnored()) {
-                                add(genreFilter.toJsonObject("genre_ids"))
-                            }
-
-                            if (query != "") {
-                                add(
-                                    JsonObject().apply {
-                                        addProperty("name", "search_query")
-                                        addProperty("value", query)
-                                    }
-                                )
-                            }
+                    with(interestsFilter) {
+                        if (this.selected.isEmpty()) {
+                            throw Exception("Please select an Interest")
                         }
-                    )
+                        add(this.toJsonObject("audience_ids"))
+                    }
+
+                    if (lusLang != FILTER_VALUE_IGNORE) {
+                        val languageIds = languagesFilter.toJsonObject("language_ids")
+                        add(
+                            JsonObject(
+                                languageIds.toMutableMap().apply {
+                                    put(
+                                        "value",
+                                        JsonPrimitive ("+$lusLang${languageIds["value"]!!.jsonPrimitive.content}")
+                                    )
+                                }
+                            )
+                        )
+                    }
+
+                    if (tagsFilter.state.isNotEmpty()) {
+                        val tags = "+${tagsFilter.state.toLowerCase()}".replace(" ", "_")
+                            .replace("_,", "+").replace(",_", "+").replace(",", "+")
+                            .replace("+-", "-").replace("-_", "-").trim()
+                        add(
+                            buildJsonObject {
+                                put("name", "tagged")
+                                put("value", tags)
+                            }
+                        )
+                    }
+
+                    if (creatorFilter.state.isNotEmpty()) {
+                        add(
+                            buildJsonObject {
+                                put("name", "created_by_id")
+                                put("value", creatorFilter.state)
+                            }
+                        )
+                    }
+
+                    if (favoriteFilter.state.isNotEmpty()) {
+                        add(
+                            buildJsonObject {
+                                put("name", "favorite_by_user_id")
+                                put("value", favoriteFilter.state)
+                            }
+                        )
+                    }
+
+                    if (genreFilter.anyNotIgnored()) {
+                        add(genreFilter.toJsonObject("genre_ids"))
+                    }
+
+                    if (query != "") {
+                        add(
+                            buildJsonObject {
+                                put("name", "search_query")
+                                put("value", query)
+                            }
+                        )
+                    }
                 }
-            )
+            }
         }
     }
 
@@ -184,24 +193,24 @@ abstract class Luscious(
     }
 
     private fun parseAlbumListResponse(response: Response): MangasPage {
-        val data = gson.fromJson<JsonObject>(response.body!!.string())
-        with(data["data"]["album"]["list"]) {
+        val data = json.decodeFromString<JsonObject>(response.body!!.string())
+        with(data["data"]!!.jsonObject["album"]!!.jsonObject["list"]) {
             return MangasPage(
-                this["items"].asJsonArray.map {
+                this!!.jsonObject["items"]!!.jsonArray.map {
                     SManga.create().apply {
-                        url = it["url"].asString
-                        title = it["title"].asString
-                        thumbnail_url = it["cover"]["url"].asString
+                        url = it.jsonObject["url"]!!.jsonPrimitive.content
+                        title = it.jsonObject["title"]!!.jsonPrimitive.content
+                        thumbnail_url = it.jsonObject["cover"]!!.jsonObject["url"]!!.jsonPrimitive.content
                     }
                 },
-                this["info"]["has_next_page"].asBoolean
+                this.jsonObject["info"]!!.jsonObject["has_next_page"]!!.jsonPrimitive.boolean
             )
         }
     }
 
     private fun buildAlbumInfoRequestInput(id: String): JsonObject {
-        return JsonObject().apply {
-            addProperty("id", id)
+        return buildJsonObject {
+           put("id", id)
         }
     }
 
@@ -246,34 +255,34 @@ abstract class Luscious(
                 var nextPage = true
                 var page = 2
                 val id = response.request.url.queryParameter("variables").toString()
-                    .let { gson.fromJson<JsonObject>(it)["input"]["filters"].asJsonArray }
-                    .let { it.first { f -> f["name"].asString == "album_id" } }
-                    .let { it["value"].asString }
+                    .let { json.decodeFromString<JsonObject>(it)["input"]!!.jsonObject["filters"]!!.jsonArray }
+                    .let { it.first { f -> f.jsonObject["name"]!!.jsonPrimitive.content == "album_id" } }
+                    .let { it.jsonObject["value"]!!.jsonPrimitive.content }
 
-                var data = gson.fromJson<JsonObject>(response.body!!.string())
-                    .let { it["data"]["picture"]["list"].asJsonObject }
+                var data = json.decodeFromString<JsonObject>(response.body!!.string())
+                    .let { it.jsonObject["data"]!!.jsonObject["picture"]!!.jsonObject["list"]!!.jsonObject }
 
                 while (nextPage) {
-                    nextPage = data["info"]["has_next_page"].asBoolean
-                    data["items"].asJsonArray.map {
+                    nextPage = data["info"]!!.jsonObject["has_next_page"]!!.jsonPrimitive.boolean
+                    data["items"]!!.jsonArray.map {
                         val chapter = SChapter.create()
                         val url = when (getResolutionPref()) {
-                            "-1" -> it["url_to_original"].asString
-                            else -> it["thumbnails"][getResolutionPref()?.toInt()!!]["url"].asString
+                            "-1" -> it.jsonObject["url_to_original"]!!.jsonPrimitive.content
+                            else -> it.jsonObject["thumbnails"]!!.jsonObject[getResolutionPref()?.toInt()!!]!!.jsonObject["url"]!!.jsonPrimitive.content
                         }
                         when {
                             url.startsWith("//") -> chapter.url = "https:$url"
                             else -> chapter.url = url
                         }
-                        chapter.chapter_number = it["position"].asInt.toFloat()
-                        chapter.name = chapter.chapter_number.toInt().toString() + " - " + it["title"].asString
-                        chapter.date_upload = "${it["created"].asLong}000".toLong()
+                        chapter.chapter_number = it.jsonObject["position"]!!.jsonPrimitive.int.toFloat()
+                        chapter.name = chapter.chapter_number.toInt().toString() + " - " + it.jsonObject["title"]!!.jsonPrimitive.content
+                        chapter.date_upload = "${it.jsonObject["created"]!!.jsonPrimitive.long}000".toLong()
                         chapters.add(chapter)
                     }
                     if (nextPage) {
                         val newPage = client.newCall(GET(buildAlbumPicturesPageUrl(id, page))).execute()
-                        data = gson.fromJson<JsonObject>(newPage.body!!.string())
-                            .let { it["data"]["picture"]["list"].asJsonObject }
+                        data = json.decodeFromString<JsonObject>(newPage.body!!.string())
+                            .let { it["data"]!!.jsonObject["picture"]!!.jsonObject["list"]!!.jsonObject }
                     }
                     page++
                 }
@@ -288,25 +297,17 @@ abstract class Luscious(
     // Pages
 
     private fun buildAlbumPicturesRequestInput(id: String, page: Int): JsonObject {
-        return JsonObject().apply {
-            addProperty(
-                "input",
-                JsonObject().apply {
-                    addProperty(
-                        "filters",
-                        JsonArray().apply {
-                            add(
-                                JsonObject().apply {
-                                    addProperty("name", "album_id")
-                                    addProperty("value", id)
-                                }
-                            )
-                        }
-                    )
-                    addProperty("display", getSortPref())
-                    addProperty("page", page)
+        return buildJsonObject {
+            putJsonObject("input") {
+                putJsonArray("filters") {
+                    add(buildJsonObject {
+                        put("name", "album_id")
+                        put("value", id)
+                    })
                 }
-            )
+                put("display", getSortPref())
+                put("page", page)
+            }
         }
     }
 
@@ -324,20 +325,20 @@ abstract class Luscious(
         var nextPage = true
         var page = 2
         val id = response.request.url.queryParameter("variables").toString()
-            .let { gson.fromJson<JsonObject>(it)["input"]["filters"].asJsonArray }
-            .let { it.first { f -> f["name"].asString == "album_id" } }
-            .let { it["value"].asString }
+            .let { json.decodeFromString<JsonObject>(it)["input"]!!.jsonObject["filters"]!!.jsonArray }
+            .let { it.first { f -> f.jsonObject["name"]!!.jsonPrimitive.content == "album_id" } }
+            .let { it.jsonObject["value"]!!.jsonPrimitive.content }
 
-        var data = gson.fromJson<JsonObject>(response.body!!.string())
-            .let { it["data"]["picture"]["list"].asJsonObject }
+        var data = json.decodeFromString<JsonObject>(response.body!!.string())
+            .let { it["data"]!!.jsonObject["picture"]!!.jsonObject["list"]!!.jsonObject }
 
         while (nextPage) {
-            nextPage = data["info"]["has_next_page"].asBoolean
-            data["items"].asJsonArray.map {
-                val index = it["position"].asInt
+            nextPage = data["info"]!!.jsonObject["has_next_page"]!!.jsonPrimitive.boolean
+            data["items"]!!.jsonArray.map {
+                val index = it.jsonObject["position"]!!.jsonPrimitive.int
                 val url = when (getResolutionPref()) {
-                    "-1" -> it["url_to_original"].asString
-                    else -> it["thumbnails"][getResolutionPref()?.toInt()!!]["url"].asString
+                    "-1" -> it.jsonObject["url_to_original"]!!.jsonPrimitive.content
+                    else -> it.jsonObject["thumbnails"]!!.jsonObject[getResolutionPref()?.toInt()!!]!!.jsonObject["url"]!!.jsonPrimitive.content
                 }
                 when {
                     url.startsWith("//") -> pages.add(Page(index, "https:$url", "https:$url"))
@@ -346,8 +347,8 @@ abstract class Luscious(
             }
             if (nextPage) {
                 val newPage = client.newCall(GET(buildAlbumPicturesPageUrl(id, page))).execute()
-                data = gson.fromJson<JsonObject>(newPage.body!!.string())
-                    .let { it["data"]["picture"]["list"].asJsonObject }
+                data = json.decodeFromString<JsonObject>(newPage.body!!.string())
+                    .let { it["data"]!!.jsonObject["picture"]!!.jsonObject["list"]!!.jsonObject }
             }
             page++
         }
@@ -381,12 +382,12 @@ abstract class Luscious(
         return client.newCall(GET(page.url, headers))
             .asObservableSuccess()
             .map {
-                val data = gson.fromJson<JsonObject>(it.body!!.string()).let { data ->
-                    data["data"]["picture"]["list"].asJsonObject
+                val data = json.decodeFromString<JsonObject>(it.body!!.string()).let { data ->
+                    data["data"]!!.jsonObject["picture"]!!.jsonObject["list"]!!.jsonObject
                 }
                 when (getResolutionPref()) {
-                    "-1" -> data["items"].asJsonArray[page.index % 50].asJsonObject["url_to_original"].asString
-                    else -> data["items"].asJsonArray[page.index % 50].asJsonObject["thumbnails"][getResolutionPref()?.toInt()!!]["url"].asString
+                    "-1" -> data["items"]!!.jsonArray[page.index % 50].jsonObject["url_to_original"]!!.jsonPrimitive.content
+                    else -> data["items"]!!.jsonArray[page.index % 50].jsonObject["thumbnails"]!!.jsonObject[getResolutionPref()?.toInt()!!]!!.jsonObject["url"]!!.jsonPrimitive.content
                 }
             }
     }
@@ -405,32 +406,32 @@ abstract class Luscious(
     }
 
     private fun detailsParse(response: Response): SManga {
-        val data = gson.fromJson<JsonObject>(response.body!!.string())
-        with(data["data"]["album"]["get"]) {
+        val data = json.decodeFromString<JsonObject>(response.body!!.string())
+        with(data["data"]!!.jsonObject["album"]!!.jsonObject["get"]!!.jsonObject) {
             val manga = SManga.create()
-            manga.url = this["url"].asString
-            manga.title = this["title"].asString
-            manga.thumbnail_url = this["cover"]["url"].asString
+            manga.url = this["url"]!!.jsonPrimitive.content
+            manga.title = this["title"]!!.jsonPrimitive.content
+            manga.thumbnail_url = this["cover"]!!.jsonObject["url"]!!.jsonPrimitive.content
             manga.status = 0
-            manga.description = "${this["description"].asString}\n\nPictures: ${this["number_of_pictures"].asString}\nAnimated Pictures: ${this["number_of_animated_pictures"].asString}"
-            var genreList = this["language"]["title"].asString
-            for ((i, _) in this["labels"].asJsonArray.withIndex()) {
-                genreList = "$genreList, ${this["labels"][i].asString}"
+            manga.description = "${this["description"]!!.jsonPrimitive.content}\n\nPictures: ${this["number_of_pictures"]!!.jsonPrimitive.content}\nAnimated Pictures: ${this["number_of_animated_pictures"]!!.jsonPrimitive.content}"
+            var genreList = this["language"]!!.jsonObject["title"]!!.jsonPrimitive.content
+            for ((i, _) in this["labels"]!!.jsonArray.withIndex()) {
+                genreList = "$genreList, ${this["labels"]!!.jsonArray[i].jsonPrimitive.content}"
             }
-            for ((i, _) in this["genres"].asJsonArray.withIndex()) {
-                genreList = "$genreList, ${this["genres"][i]["title"].asString}"
+            for ((i, _) in this["genres"]!!.jsonArray.withIndex()) {
+                genreList = "$genreList, ${this["genres"]!!.jsonArray[i].jsonObject["title"]!!.jsonPrimitive.content}"
             }
-            for ((i, _) in this["audiences"].asJsonArray.withIndex()) {
-                genreList = "$genreList, ${this["audiences"][i]["title"].asString}"
+            for ((i, _) in this["audiences"]!!.jsonArray.withIndex()) {
+                genreList = "$genreList, ${this["audiences"]!!.jsonArray[i].jsonObject["title"]!!.jsonPrimitive.content}"
             }
-            for ((i, _) in this["tags"].asJsonArray.withIndex()) {
-                genreList = "$genreList, ${this["tags"][i]["text"].asString}"
-                if (this["tags"][i]["text"].asString.contains("Artist:")) {
-                    manga.artist = this["tags"][i]["text"].asString.substringAfter(":").trim()
+            for ((i, _) in this["tags"]!!.jsonArray.withIndex()) {
+                genreList = "$genreList, ${this["tags"]!!.jsonArray[i].jsonObject["text"]!!.jsonPrimitive.content}"
+                if (this["tags"]!!.jsonArray[i].jsonObject["text"]!!.jsonPrimitive.content.contains("Artist:")) {
+                    manga.artist = this["tags"]!!.jsonArray[i].jsonObject["text"]!!.jsonPrimitive.content.substringAfter(":").trim()
                     manga.author = manga.artist
                 }
             }
-            genreList = "$genreList, ${this["content"]["title"].asString}"
+            genreList = "$genreList, ${this["content"]!!.jsonObject["title"]!!.jsonPrimitive.content}"
             manga.genre = genreList
 
             return manga
@@ -483,9 +484,9 @@ abstract class Luscious(
 
     private fun Filter<*>.toJsonObject(key: String): JsonObject {
         val value = this.toString()
-        return JsonObject().apply {
-            addProperty("name", key)
-            addProperty("value", value)
+        return buildJsonObject {
+            put("name", key)
+            put("value", value)
         }
     }
 
diff --git a/multisrc/src/main/java/eu/kanade/tachiyomi/multisrc/mmrcms/MMRCMS.kt b/multisrc/src/main/java/eu/kanade/tachiyomi/multisrc/mmrcms/MMRCMS.kt
index ff453eacd..1847fbadc 100644
--- a/multisrc/src/main/java/eu/kanade/tachiyomi/multisrc/mmrcms/MMRCMS.kt
+++ b/multisrc/src/main/java/eu/kanade/tachiyomi/multisrc/mmrcms/MMRCMS.kt
@@ -2,13 +2,6 @@ package eu.kanade.tachiyomi.multisrc.mmrcms
 
 import android.annotation.SuppressLint
 import android.net.Uri
-import com.github.salomonbrys.kotson.array
-import com.github.salomonbrys.kotson.bool
-import com.github.salomonbrys.kotson.get
-import com.github.salomonbrys.kotson.string
-import com.google.gson.JsonArray
-import com.google.gson.JsonObject
-import com.google.gson.JsonParser
 import eu.kanade.tachiyomi.network.GET
 import eu.kanade.tachiyomi.network.asObservableSuccess
 import eu.kanade.tachiyomi.source.model.Filter
@@ -19,11 +12,20 @@ import eu.kanade.tachiyomi.source.model.SChapter
 import eu.kanade.tachiyomi.source.model.SManga
 import eu.kanade.tachiyomi.source.online.HttpSource
 import eu.kanade.tachiyomi.util.asJsoup
+import kotlinx.serialization.decodeFromString
+import kotlinx.serialization.json.Json
+import kotlinx.serialization.json.JsonArray
+import kotlinx.serialization.json.JsonObject
+import kotlinx.serialization.json.boolean
+import kotlinx.serialization.json.jsonArray
+import kotlinx.serialization.json.jsonObject
+import kotlinx.serialization.json.jsonPrimitive
 import okhttp3.OkHttpClient
 import okhttp3.Request
 import okhttp3.Response
 import org.jsoup.nodes.Element
 import rx.Observable
+import uy.kohesive.injekt.injectLazy
 import java.text.ParseException
 import java.text.SimpleDateFormat
 import java.util.Locale
@@ -33,7 +35,7 @@ abstract class MMRCMS(
     override val name: String,
     override val baseUrl: String,
     override val lang: String,
-    private val sourceInfo: String = "",
+    sourceInfo: String = "",
 ) : HttpSource() {
     open val jsonData = if (sourceInfo == "") {
         SourceData.giveMetaData(baseUrl)
@@ -72,14 +74,15 @@ abstract class MMRCMS(
      *
      *
      */
-    open val jsonObject = JsonParser.parseString(jsonData) as JsonObject
-    override val supportsLatest = jsonObject["supports_latest"].bool
-    open val itemUrl = jsonObject["item_url"].string
-    open val categoryMappings = mapToPairs(jsonObject["categories"].array)
-    open var tagMappings = if (jsonObject["tags"].isJsonArray) {
-        mapToPairs(jsonObject["tags"].asJsonArray)
+    private val json: Json by injectLazy()
+    val jsonObject = json.decodeFromString<JsonObject>(jsonData)
+    override val supportsLatest = jsonObject["supports_latest"]!!.jsonPrimitive.boolean
+    open val itemUrl = jsonObject["item_url"]!!.jsonPrimitive.content
+    open val categoryMappings = mapToPairs(jsonObject["categories"]!!.jsonArray)
+    open var tagMappings = if (jsonObject["tags"] is JsonArray) {
+        mapToPairs(jsonObject["tags"]!!.jsonArray)
     } else {
-        emptyList<Pair<String, String>>()
+        emptyList()
     }
 
     /**
@@ -95,7 +98,7 @@ abstract class MMRCMS(
     open fun mapToPairs(array: JsonArray): List<Pair<String, String>> = array.map {
         it as JsonObject
 
-        it["id"].string to it["name"].string
+        it["id"]!!.jsonPrimitive.content to it["name"]!!.jsonPrimitive.content
     }
 
     private val itemUrlPath = Uri.parse(itemUrl).pathSegments.firstOrNull()
@@ -153,16 +156,16 @@ abstract class MMRCMS(
     override fun searchMangaParse(response: Response): MangasPage {
         return if (listOf("query", "q").any { it in response.request.url.queryParameterNames }) {
             // If a search query was specified, use search instead!
-            val jsonArray = JsonParser.parseString(response.body!!.string()).let {
-                it["suggestions"].array
+            val jsonArray = json.decodeFromString<JsonObject>(response.body!!.string()).let {
+                it["suggestions"]!!.jsonArray
             }
             MangasPage(
                 jsonArray
                     .map {
                         SManga.create().apply {
-                            val segment = it["data"].string
+                            val segment = it.jsonObject["data"]!!.jsonPrimitive.content
                             url = getUrlWithoutBaseUrl(itemUrl + segment)
-                            title = it["value"].string
+                            title = it.jsonObject["value"]!!.jsonPrimitive.content
 
                             // Guess thumbnails
                             // thumbnail_url = "$baseUrl/uploads/manga/$segment/cover/cover_250x350.jpg"
diff --git a/src/all/toomics/src/eu/kanade/tachiyomi/extension/all/toomics/ToomicsGlobal.kt b/src/all/toomics/src/eu/kanade/tachiyomi/extension/all/toomics/ToomicsGlobal.kt
index 8d6e69244..fe245a359 100644
--- a/src/all/toomics/src/eu/kanade/tachiyomi/extension/all/toomics/ToomicsGlobal.kt
+++ b/src/all/toomics/src/eu/kanade/tachiyomi/extension/all/toomics/ToomicsGlobal.kt
@@ -10,7 +10,7 @@ import eu.kanade.tachiyomi.source.online.ParsedHttpSource
 import okhttp3.Headers
 import okhttp3.OkHttpClient
 import okhttp3.Request
-import okhttp3.RequestBody
+import okhttp3.RequestBody.Companion.toRequestBody
 import org.jsoup.nodes.Document
 import org.jsoup.nodes.Element
 import rx.Observable
@@ -73,7 +73,7 @@ abstract class ToomicsGlobal(
             .add("Content-Type", "application/x-www-form-urlencoded")
             .build()
 
-        val rbody = RequestBody.create(null, "toonData=$query&offset=0&limit=20")
+        val rbody = "toonData=$query&offset=0&limit=20".toRequestBody(null)
 
         return POST("$baseUrl/$siteLang/webtoon/ajax_search", newHeaders, rbody)
     }
diff --git a/src/ar/gmanga/build.gradle b/src/ar/gmanga/build.gradle
index ad435ab75..98163747e 100644
--- a/src/ar/gmanga/build.gradle
+++ b/src/ar/gmanga/build.gradle
@@ -1,5 +1,6 @@
 apply plugin: 'com.android.application'
 apply plugin: 'kotlin-android'
+apply plugin: 'kotlinx-serialization'
 
 ext {
     extName = 'GMANGA'
diff --git a/src/ar/gmanga/src/eu/kanade/tachiyomi/extension/ar/gmanga/Gmanga.kt b/src/ar/gmanga/src/eu/kanade/tachiyomi/extension/ar/gmanga/Gmanga.kt
index 2abf35991..bda21d9b8 100644
--- a/src/ar/gmanga/src/eu/kanade/tachiyomi/extension/ar/gmanga/Gmanga.kt
+++ b/src/ar/gmanga/src/eu/kanade/tachiyomi/extension/ar/gmanga/Gmanga.kt
@@ -1,13 +1,6 @@
 package eu.kanade.tachiyomi.extension.ar.gmanga
 
 import androidx.preference.PreferenceScreen
-import com.github.salomonbrys.kotson.fromJson
-import com.github.salomonbrys.kotson.get
-import com.github.salomonbrys.kotson.nullString
-import com.github.salomonbrys.kotson.toJsonArray
-import com.google.gson.Gson
-import com.google.gson.JsonArray
-import com.google.gson.JsonObject
 import eu.kanade.tachiyomi.extension.ar.gmanga.GmangaPreferences.Companion.PREF_CHAPTER_LISTING
 import eu.kanade.tachiyomi.extension.ar.gmanga.GmangaPreferences.Companion.PREF_CHAPTER_LISTING_SHOW_POPULAR
 import eu.kanade.tachiyomi.lib.ratelimit.RateLimitInterceptor
@@ -21,12 +14,24 @@ import eu.kanade.tachiyomi.source.model.SChapter
 import eu.kanade.tachiyomi.source.model.SManga
 import eu.kanade.tachiyomi.source.online.HttpSource
 import eu.kanade.tachiyomi.util.asJsoup
+import kotlinx.serialization.decodeFromString
+import kotlinx.serialization.json.Json
+import kotlinx.serialization.json.JsonArray
+import kotlinx.serialization.json.JsonObject
+import kotlinx.serialization.json.contentOrNull
+import kotlinx.serialization.json.float
+import kotlinx.serialization.json.jsonArray
+import kotlinx.serialization.json.jsonObject
+import kotlinx.serialization.json.jsonPrimitive
+import kotlinx.serialization.json.long
 import okhttp3.Headers
 import okhttp3.MediaType.Companion.toMediaTypeOrNull
 import okhttp3.OkHttpClient
 import okhttp3.Request
 import okhttp3.RequestBody
+import okhttp3.RequestBody.Companion.toRequestBody
 import okhttp3.Response
+import uy.kohesive.injekt.injectLazy
 
 class Gmanga : ConfigurableSource, HttpSource() {
 
@@ -40,7 +45,7 @@ class Gmanga : ConfigurableSource, HttpSource() {
 
     override val supportsLatest: Boolean = true
 
-    private val gson = Gson()
+    private val json: Json by injectLazy()
 
     private val preferences = GmangaPreferences(id)
 
@@ -67,18 +72,18 @@ class Gmanga : ConfigurableSource, HttpSource() {
 
         val chapters: List<JsonArray> = buildList {
             val allChapters: ArrayList<JsonArray> = ArrayList()
-            data["rows"][0]["rows"].asJsonArray.forEach { release ->
-                val chapter = data["rows"][2]["rows"].asJsonArray.filter { it[0] == release[4] }.toJsonArray()
-                chapter.asJsonArray.forEach { release.asJsonArray.addAll(it.asJsonArray) }
-                val team = data["rows"][1]["rows"].asJsonArray.filter { it[0] == release[5] }.toJsonArray()
-                team.asJsonArray.forEach { release.asJsonArray.addAll(it.asJsonArray) }
-                allChapters.add(release.asJsonArray)
+            data["rows"]!!.jsonArray[0].jsonObject["rows"]!!.jsonArray.forEach { release ->
+                val chapter = data["rows"]!!.jsonArray[2].jsonObject["rows"]!!.jsonArray.filter { it.jsonArray[0] == release.jsonArray[4] }
+                allChapters.addAll(chapter.map { it.jsonArray })
+                val team = data["rows"]!!.jsonArray[1].jsonObject["rows"]!!.jsonArray.filter { it.jsonArray[0] == release.jsonArray[5] }
+                allChapters.addAll(team.map { it.jsonArray })
+                allChapters.add(release.jsonArray)
             }
 
             when (preferences.getString(PREF_CHAPTER_LISTING)) {
                 PREF_CHAPTER_LISTING_SHOW_POPULAR -> addAll(
-                    allChapters.groupBy { it.asJsonArray[4].asFloat }
-                        .map { (_: Float, versions: List<JsonArray>) -> versions.maxByOrNull { it[5].asLong }!! }
+                    allChapters.groupBy { it.jsonArray[4].jsonPrimitive.float }
+                        .map { (_: Float, versions: List<JsonArray>) -> versions.maxByOrNull { it[5].jsonPrimitive.float }!! }
                 )
                 else -> addAll(allChapters)
             }
@@ -86,14 +91,14 @@ class Gmanga : ConfigurableSource, HttpSource() {
 
         return chapters.map {
             SChapter.create().apply {
-                chapter_number = it[8].asFloat
+                chapter_number = it[8].jsonPrimitive.float
 
-                val chapterName = it[10].asString.let { if (it.trim() != "") " - $it" else "" }
+                val chapterName = it[10].jsonPrimitive.content.let { if (it.trim() != "") " - $it" else "" }
 
                 url = "/r/${it[0]}"
                 name = "${chapter_number.let { if (it % 1 > 0) it else it.toInt() }}$chapterName"
-                date_upload = it[2].asLong * 1000
-                scanlator = it[13].asString
+                date_upload = it[2].jsonPrimitive.long * 1000
+                scanlator = it[13].jsonPrimitive.content
             }
         }
     }
@@ -101,16 +106,16 @@ class Gmanga : ConfigurableSource, HttpSource() {
     override fun imageUrlParse(response: Response): String = throw UnsupportedOperationException("Not used")
 
     override fun latestUpdatesParse(response: Response): MangasPage {
-        val data = gson.fromJson<JsonObject>(response.asJsoup().select(".js-react-on-rails-component").html())
+        val data = json.decodeFromString<JsonObject>(response.asJsoup().select(".js-react-on-rails-component").html())
         return MangasPage(
-            data["mangaDataAction"]["newMangas"].asJsonArray.map {
+            data["mangaDataAction"]!!.jsonObject["newMangas"]!!.jsonArray.map {
                 SManga.create().apply {
-                    url = "/mangas/${it["id"].asString}"
-                    title = it["title"].asString
+                    url = "/mangas/${it.jsonObject["id"]!!.jsonPrimitive.content}"
+                    title = it.jsonObject["title"]!!.jsonPrimitive.content
 
-                    thumbnail_url = it["cover"].nullString?.let { coverFileName ->
+                    thumbnail_url = it.jsonObject["cover"]!!.jsonPrimitive.contentOrNull?.let { coverFileName ->
                         val thumbnail = "medium_${coverFileName.substringBeforeLast(".")}.webp"
-                        "https://media.$domain/uploads/manga/cover/${it["id"].asString}/$thumbnail"
+                        "https://media.$domain/uploads/manga/cover/${it.jsonObject["id"]!!.jsonPrimitive.content}/$thumbnail"
                     }
                 }
             },
@@ -123,27 +128,27 @@ class Gmanga : ConfigurableSource, HttpSource() {
     }
 
     override fun mangaDetailsParse(response: Response): SManga {
-        val data = gson.fromJson<JsonObject>(response.asJsoup().select(".js-react-on-rails-component").html())
-        val mangaData = data["mangaDataAction"]["mangaData"].asJsonObject
+        val data = json.decodeFromString<JsonObject>(response.asJsoup().select(".js-react-on-rails-component").html())
+        val mangaData = data["mangaDataAction"]!!.jsonObject["mangaData"]!!.jsonObject
         return SManga.create().apply {
-            description = mangaData["summary"].nullString ?: ""
-            artist = mangaData["artists"].asJsonArray.joinToString(", ") { it.asJsonObject["name"].asString }
-            author = mangaData["authors"].asJsonArray.joinToString(", ") { it.asJsonObject["name"].asString }
-            genre = mangaData["categories"].asJsonArray.joinToString(", ") { it.asJsonObject["name"].asString }
+            description = mangaData["summary"]!!.jsonPrimitive.contentOrNull ?: ""
+            artist = mangaData["artists"]!!.jsonArray.joinToString(", ") { it.jsonObject["name"]!!.jsonPrimitive.content }
+            author = mangaData["authors"]!!.jsonArray.joinToString(", ") { it.jsonObject["name"]!!.jsonPrimitive.content }
+            genre = mangaData["categories"]!!.jsonArray.joinToString(", ") { it.jsonObject["name"]!!.jsonPrimitive.content }
         }
     }
 
     override fun pageListParse(response: Response): List<Page> {
         val url = response.request.url.toString()
-        val data = gson.fromJson<JsonObject>(response.asJsoup().select(".js-react-on-rails-component").html())
-        val releaseData = data["readerDataAction"]["readerData"]["release"].asJsonObject
+        val data = json.decodeFromString<JsonObject>(response.asJsoup().select(".js-react-on-rails-component").html())
+        val releaseData = data["readerDataAction"]!!.jsonObject["readerData"]!!.jsonObject["release"]!!.jsonObject
 
-        val hasWebP = releaseData["webp_pages"].asJsonArray.size() > 0
-        return releaseData[if (hasWebP) "webp_pages" else "pages"].asJsonArray.map { it.asString }.mapIndexed { index, pageUri ->
+        val hasWebP = releaseData["webp_pages"]!!.jsonArray.size > 0
+        return releaseData[if (hasWebP) "webp_pages" else "pages"]!!.jsonArray.map { it.jsonPrimitive.content }.mapIndexed { index, pageUri ->
             Page(
                 index,
                 "$url#page_$index",
-                "https://media.$domain/uploads/releases/${releaseData["storage_key"].asString}/hq${if (hasWebP) "_webp" else ""}/$pageUri"
+                "https://media.$domain/uploads/releases/${releaseData["storage_key"]!!.jsonPrimitive.content}/hq${if (hasWebP) "_webp" else ""}/$pageUri"
             )
         }
     }
@@ -154,29 +159,29 @@ class Gmanga : ConfigurableSource, HttpSource() {
 
     override fun searchMangaParse(response: Response): MangasPage {
         val data = decryptResponse(response)
-        val mangas = data["mangas"].asJsonArray
+        val mangas = data["mangas"]!!.jsonArray
         return MangasPage(
-            mangas.asJsonArray.map {
+            mangas.jsonArray.map {
                 SManga.create().apply {
-                    url = "/mangas/${it["id"].asString}"
-                    title = it["title"].asString
-                    val thumbnail = "medium_${it["cover"].asString.substringBeforeLast(".")}.webp"
-                    thumbnail_url = "https://media.$domain/uploads/manga/cover/${it["id"].asString}/$thumbnail"
+                    url = "/mangas/${it.jsonObject["id"]!!.jsonPrimitive.content}"
+                    title = it.jsonObject["title"]!!.jsonPrimitive.content
+                    val thumbnail = "medium_${it.jsonObject["cover"]!!.jsonPrimitive.content.substringBeforeLast(".")}.webp"
+                    thumbnail_url = "https://media.$domain/uploads/manga/cover/${it.jsonObject["id"]!!.jsonPrimitive.content}/$thumbnail"
                 }
             },
-            mangas.size() == 50
+            mangas.size == 50
         )
     }
 
     private fun decryptResponse(response: Response): JsonObject {
-        val encryptedData = gson.fromJson<JsonObject>(response.body!!.string())["data"].asString
+        val encryptedData = json.decodeFromString<JsonObject>(response.body!!.string())["data"]!!.jsonPrimitive.content
         val decryptedData = decrypt(encryptedData)
-        return gson.fromJson(decryptedData)
+        return json.decodeFromString(decryptedData)
     }
 
     override fun searchMangaRequest(page: Int, query: String, filters: FilterList): Request {
         return GmangaFilters.buildSearchPayload(page, query, if (filters.isEmpty()) getFilterList() else filters).let {
-            val body = RequestBody.create(MEDIA_TYPE, it.toString())
+            val body = it.toString().toRequestBody(MEDIA_TYPE)
             POST("$baseUrl/api/mangas/search", headers, body)
         }
     }
diff --git a/src/ar/gmanga/src/eu/kanade/tachiyomi/extension/ar/gmanga/GmangaFilters.kt b/src/ar/gmanga/src/eu/kanade/tachiyomi/extension/ar/gmanga/GmangaFilters.kt
index 6c816697c..b77f09532 100644
--- a/src/ar/gmanga/src/eu/kanade/tachiyomi/extension/ar/gmanga/GmangaFilters.kt
+++ b/src/ar/gmanga/src/eu/kanade/tachiyomi/extension/ar/gmanga/GmangaFilters.kt
@@ -1,14 +1,16 @@
 package eu.kanade.tachiyomi.extension.ar.gmanga
 
 import android.annotation.SuppressLint
-import com.github.salomonbrys.kotson.addAll
-import com.github.salomonbrys.kotson.addProperty
-import com.google.gson.JsonArray
-import com.google.gson.JsonNull
-import com.google.gson.JsonObject
 import eu.kanade.tachiyomi.source.model.Filter
 import eu.kanade.tachiyomi.source.model.FilterList
-import java.lang.Exception
+import kotlinx.serialization.json.JsonNull
+import kotlinx.serialization.json.JsonObject
+import kotlinx.serialization.json.JsonObjectBuilder
+import kotlinx.serialization.json.add
+import kotlinx.serialization.json.buildJsonObject
+import kotlinx.serialization.json.put
+import kotlinx.serialization.json.putJsonArray
+import kotlinx.serialization.json.putJsonObject
 import java.text.ParseException
 import java.text.SimpleDateFormat
 
@@ -35,139 +37,90 @@ class GmangaFilters() {
             val dateRangeFilter = filters.findInstance<DateRangeFilter>()!!
             val categoryFilter = filters.findInstance<CategoryFilter>()!!
 
-            return JsonObject().apply {
-
+            return buildJsonObject {
                 oneShotFilter.state.first().let {
                     when {
-                        it.isIncluded() -> addProperty("oneshot", true)
-                        it.isExcluded() -> addProperty("oneshot", false)
-                        else -> addProperty("oneshot", JsonNull.INSTANCE)
+                        it.isIncluded() -> put("oneshot", true)
+                        it.isExcluded() -> put("oneshot", false)
+                        else -> put("oneshot", JsonNull)
                     }
                 }
 
-                addProperty("title", query)
-                addProperty("page", page)
-                addProperty(
-                    "manga_types",
-                    JsonObject().apply {
-
-                        addProperty(
-                            "include",
-                            JsonArray().apply {
-                                addAll(mangaTypeFilter.state.filter { it.isIncluded() }.map { it.id })
-                            }
-                        )
-
-                        addProperty(
-                            "exclude",
-                            JsonArray().apply {
-                                addAll(mangaTypeFilter.state.filter { it.isExcluded() }.map { it.id })
-                            }
-                        )
+                put("title", query)
+                put("page", page)
+                putJsonObject("manga_types") {
+                    putJsonArray("include") {
+                        mangaTypeFilter.state.filter { it.isIncluded() }.map { it.id }.forEach { add(it) }
                     }
-                )
-                addProperty(
-                    "story_status",
-                    JsonObject().apply {
 
-                        addProperty(
-                            "include",
-                            JsonArray().apply {
-                                addAll(storyStatusFilter.state.filter { it.isIncluded() }.map { it.id })
-                            }
-                        )
-
-                        addProperty(
-                            "exclude",
-                            JsonArray().apply {
-                                addAll(storyStatusFilter.state.filter { it.isExcluded() }.map { it.id })
-                            }
-                        )
+                    putJsonArray("exclude") {
+                        mangaTypeFilter.state.filter { it.isExcluded() }.map { it.id }.forEach { add(it) }
                     }
-                )
-                addProperty(
-                    "translation_status",
-                    JsonObject().apply {
-
-                        addProperty(
-                            "include",
-                            JsonArray().apply {
-                                addAll(translationStatusFilter.state.filter { it.isIncluded() }.map { it.id })
-                            }
-                        )
-
-                        addProperty(
-                            "exclude",
-                            JsonArray().apply {
-                                addAll(translationStatusFilter.state.filter { it.isExcluded() }.map { it.id })
-                            }
-                        )
+                }
+                putJsonObject("story_status") {
+                    putJsonArray("include") {
+                        storyStatusFilter.state.filter { it.isIncluded() }.map { it.id }.forEach { add(it) }
                     }
-                )
-                addProperty(
-                    "categories",
-                    JsonObject().apply {
 
-                        addProperty(
-                            "include",
-                            JsonArray().apply {
-                                add(JsonNull.INSTANCE) // always included, maybe to avoid shifting index in the backend
-                                addAll(categoryFilter.state.filter { it.isIncluded() }.map { it.id })
-                            }
-                        )
-
-                        addProperty(
-                            "exclude",
-                            JsonArray().apply {
-                                addAll(categoryFilter.state.filter { it.isExcluded() }.map { it.id })
-                            }
-                        )
+                    putJsonArray("exclude") {
+                        storyStatusFilter.state.filter { it.isExcluded() }.map { it.id }.forEach { add(it) }
                     }
-                )
-                addProperty(
-                    "chapters",
-                    JsonObject().apply {
-
-                        addPropertyFromValidatingTextFilter(
-                            chapterCountFilter.state.first {
-                                it.id == FILTER_ID_MIN_CHAPTER_COUNT
-                            },
-                            "min",
-                            ERROR_INVALID_MIN_CHAPTER_COUNT,
-                            ""
-                        )
-
-                        addPropertyFromValidatingTextFilter(
-                            chapterCountFilter.state.first {
-                                it.id == FILTER_ID_MAX_CHAPTER_COUNT
-                            },
-                            "max",
-                            ERROR_INVALID_MAX_CHAPTER_COUNT,
-                            ""
-                        )
+                }
+                putJsonObject("translation_status") {
+                    putJsonArray("include") {
+                        translationStatusFilter.state.filter { it.isIncluded() }.map { it.id }.forEach { add(it) }
                     }
-                )
-                addProperty(
-                    "dates",
-                    JsonObject().apply {
 
-                        addPropertyFromValidatingTextFilter(
-                            dateRangeFilter.state.first {
-                                it.id == FILTER_ID_START_DATE
-                            },
-                            "start",
-                            ERROR_INVALID_START_DATE
-                        )
-
-                        addPropertyFromValidatingTextFilter(
-                            dateRangeFilter.state.first {
-                                it.id == FILTER_ID_END_DATE
-                            },
-                            "end",
-                            ERROR_INVALID_END_DATE
-                        )
+                    putJsonArray("exclude") {
+                        translationStatusFilter.state.filter { it.isExcluded() }.map { it.id }.forEach { add(it) }
                     }
-                )
+                }
+                putJsonObject("categories") {
+                    putJsonArray("include") {
+                        add(JsonNull) // always included, maybe to avoid shifting index in the backend
+                        categoryFilter.state.filter { it.isIncluded() }.map { it.id }.forEach { add(it) }
+                    }
+
+                    putJsonArray("exclude") {
+                        categoryFilter.state.filter { it.isExcluded() }.map { it.id }.forEach { add(it) }
+                    }
+                }
+                putJsonObject("chapters") {
+                    putFromValidatingTextFilter(
+                        chapterCountFilter.state.first {
+                            it.id == FILTER_ID_MIN_CHAPTER_COUNT
+                        },
+                        "min",
+                        ERROR_INVALID_MIN_CHAPTER_COUNT,
+                        ""
+                    )
+
+                    putFromValidatingTextFilter(
+                        chapterCountFilter.state.first {
+                            it.id == FILTER_ID_MAX_CHAPTER_COUNT
+                        },
+                        "max",
+                        ERROR_INVALID_MAX_CHAPTER_COUNT,
+                        ""
+                    )
+                }
+                putJsonObject("dates") {
+                    putFromValidatingTextFilter(
+                        dateRangeFilter.state.first {
+                            it.id == FILTER_ID_START_DATE
+                        },
+                        "start",
+                        ERROR_INVALID_START_DATE
+                    )
+
+                    putFromValidatingTextFilter(
+                        dateRangeFilter.state.first {
+                            it.id == FILTER_ID_END_DATE
+                        },
+                        "end",
+                        ERROR_INVALID_END_DATE
+                    )
+                }
             }
         }
 
@@ -298,7 +251,7 @@ class GmangaFilters() {
             }
         }
 
-        private fun JsonObject.addPropertyFromValidatingTextFilter(
+        private fun JsonObjectBuilder.putFromValidatingTextFilter(
             filter: ValidatingTextFilter,
             property: String,
             invalidErrorMessage: String,
@@ -307,9 +260,9 @@ class GmangaFilters() {
             filter.let {
                 when {
                     it.state == "" -> if (default == null) {
-                        addProperty(property, JsonNull.INSTANCE)
-                    } else addProperty(property, default)
-                    it.isValid() -> addProperty(property, it.state)
+                        put(property, JsonNull)
+                    } else put(property, default)
+                    it.isValid() -> put(property, it.state)
                     else -> throw Exception(invalidErrorMessage)
                 }
             }
diff --git a/src/de/mangatube/build.gradle b/src/de/mangatube/build.gradle
index c7bc04b1b..2f2eeef89 100644
--- a/src/de/mangatube/build.gradle
+++ b/src/de/mangatube/build.gradle
@@ -1,5 +1,6 @@
 apply plugin: 'com.android.application'
 apply plugin: 'kotlin-android'
+apply plugin: 'kotlinx-serialization'
 
 ext {
     extName = 'Manga Tube'
diff --git a/src/de/mangatube/src/eu/kanade/tachiyomi/extension/de/mangatube/MangaTube.kt b/src/de/mangatube/src/eu/kanade/tachiyomi/extension/de/mangatube/MangaTube.kt
index 0b506b185..d1fe108f1 100644
--- a/src/de/mangatube/src/eu/kanade/tachiyomi/extension/de/mangatube/MangaTube.kt
+++ b/src/de/mangatube/src/eu/kanade/tachiyomi/extension/de/mangatube/MangaTube.kt
@@ -1,10 +1,5 @@
 package eu.kanade.tachiyomi.extension.de.mangatube
 
-import com.github.salomonbrys.kotson.fromJson
-import com.github.salomonbrys.kotson.get
-import com.google.gson.Gson
-import com.google.gson.JsonArray
-import com.google.gson.JsonObject
 import eu.kanade.tachiyomi.network.GET
 import eu.kanade.tachiyomi.network.POST
 import eu.kanade.tachiyomi.network.asObservableSuccess
@@ -14,14 +9,22 @@ import eu.kanade.tachiyomi.source.model.Page
 import eu.kanade.tachiyomi.source.model.SChapter
 import eu.kanade.tachiyomi.source.model.SManga
 import eu.kanade.tachiyomi.source.online.ParsedHttpSource
+import kotlinx.serialization.decodeFromString
+import kotlinx.serialization.json.Json
+import kotlinx.serialization.json.JsonArray
+import kotlinx.serialization.json.JsonObject
+import kotlinx.serialization.json.jsonArray
+import kotlinx.serialization.json.jsonObject
+import kotlinx.serialization.json.jsonPrimitive
 import okhttp3.Headers
 import okhttp3.OkHttpClient
 import okhttp3.Request
-import okhttp3.RequestBody
+import okhttp3.RequestBody.Companion.toRequestBody
 import okhttp3.Response
 import org.jsoup.nodes.Document
 import org.jsoup.nodes.Element
 import rx.Observable
+import uy.kohesive.injekt.injectLazy
 import java.text.ParseException
 import java.text.SimpleDateFormat
 import java.util.Locale
@@ -45,7 +48,7 @@ class MangaTube : ParsedHttpSource() {
 
     private val xhrHeaders: Headers = headersBuilder().add("Content-Type", "application/x-www-form-urlencoded; charset=UTF-8").build()
 
-    private val gson by lazy { Gson() }
+    private val json: Json by injectLazy()
 
     // Popular
 
@@ -59,21 +62,21 @@ class MangaTube : ParsedHttpSource() {
 
     override fun popularMangaRequest(page: Int): Request {
         val rbodyContent = "action=load_series_list_entries&parameter%5Bpage%5D=$page&parameter%5Bletter%5D=&parameter%5Bsortby%5D=popularity&parameter%5Border%5D=asc"
-        return POST("$baseUrl/ajax", xhrHeaders, RequestBody.create(null, rbodyContent))
+        return POST("$baseUrl/ajax", xhrHeaders, rbodyContent.toRequestBody(null))
     }
 
     // popular uses "success" as a key, search uses "suggestions"
     // for future reference: if adding filters, advanced search might use a different key
     private fun parseMangaFromJson(response: Response, hasNextPage: Boolean): MangasPage {
         var titleKey = "manga_title"
-        val mangas = gson.fromJson<JsonObject>(response.body!!.string())
-            .let { it["success"] ?: it["suggestions"].also { titleKey = "value" } }
-            .asJsonArray
+        val mangas = json.decodeFromString<JsonObject>(response.body!!.string())
+            .let { it["success"] ?: it["suggestions"].also { titleKey = "value" } }!!
+            .jsonArray
             .map { json ->
                 SManga.create().apply {
-                    title = json[titleKey].asString
-                    url = "/series/${json["manga_slug"].asString}"
-                    thumbnail_url = json["covers"][0]["img_name"].asString
+                    title = json.jsonObject[titleKey]!!.jsonPrimitive.content
+                    url = "/series/${json.jsonObject["manga_slug"]!!.jsonPrimitive.content}"
+                    thumbnail_url = json.jsonObject["covers"]!!.jsonArray[0].jsonObject["img_name"]!!.jsonPrimitive.content
                 }
             }
         return MangasPage(mangas, hasNextPage)
@@ -109,7 +112,7 @@ class MangaTube : ParsedHttpSource() {
 
     override fun searchMangaRequest(page: Int, query: String, filters: FilterList): Request {
         val rbodyContent = "action=search_query&parameter%5Bquery%5D=$query"
-        return POST("$baseUrl/ajax", xhrHeaders, RequestBody.create(null, rbodyContent))
+        return POST("$baseUrl/ajax", xhrHeaders, rbodyContent.toRequestBody(null))
     }
 
     override fun searchMangaParse(response: Response): MangasPage {
@@ -173,8 +176,8 @@ class MangaTube : ParsedHttpSource() {
         val jsonArray = Regex("""pages: (\[.*]),""").find(script)?.groupValues?.get(1)
             ?: throw Exception("Couldn't find JSON array")
 
-        return gson.fromJson<JsonArray>(jsonArray).mapIndexed { i, json ->
-            Page(i, "", imagePath + json.asJsonObject["file_name"].asString)
+        return json.decodeFromString<JsonArray>(jsonArray).mapIndexed { i, json ->
+            Page(i, "", imagePath + json.jsonObject["file_name"]!!.jsonPrimitive.content)
         }
     }
 
diff --git a/src/en/mangahub/build.gradle b/src/en/mangahub/build.gradle
index 92d734c22..eb775bce2 100644
--- a/src/en/mangahub/build.gradle
+++ b/src/en/mangahub/build.gradle
@@ -1,5 +1,6 @@
 apply plugin: 'com.android.application'
 apply plugin: 'kotlin-android'
+apply plugin: 'kotlinx-serialization'
 
 ext {
     extName = 'Mangahub'
diff --git a/src/en/mangahub/src/eu/kanade/tachiyomi/extension/en/mangahub/Mangahub.kt b/src/en/mangahub/src/eu/kanade/tachiyomi/extension/en/mangahub/Mangahub.kt
index e4969dba8..1a12c3f2c 100644
--- a/src/en/mangahub/src/eu/kanade/tachiyomi/extension/en/mangahub/Mangahub.kt
+++ b/src/en/mangahub/src/eu/kanade/tachiyomi/extension/en/mangahub/Mangahub.kt
@@ -1,11 +1,5 @@
 package eu.kanade.tachiyomi.extension.en.mangahub
 
-import com.github.salomonbrys.kotson.fromJson
-import com.github.salomonbrys.kotson.get
-import com.github.salomonbrys.kotson.keys
-import com.github.salomonbrys.kotson.string
-import com.google.gson.Gson
-import com.google.gson.JsonObject
 import eu.kanade.tachiyomi.network.GET
 import eu.kanade.tachiyomi.network.POST
 import eu.kanade.tachiyomi.source.model.Filter
@@ -14,12 +8,18 @@ import eu.kanade.tachiyomi.source.model.Page
 import eu.kanade.tachiyomi.source.model.SChapter
 import eu.kanade.tachiyomi.source.model.SManga
 import eu.kanade.tachiyomi.source.online.ParsedHttpSource
+import kotlinx.serialization.decodeFromString
+import kotlinx.serialization.json.Json
+import kotlinx.serialization.json.JsonObject
+import kotlinx.serialization.json.jsonObject
+import kotlinx.serialization.json.jsonPrimitive
 import okhttp3.HttpUrl.Companion.toHttpUrlOrNull
 import okhttp3.Request
-import okhttp3.RequestBody
+import okhttp3.RequestBody.Companion.toRequestBody
 import okhttp3.Response
 import org.jsoup.nodes.Document
 import org.jsoup.nodes.Element
+import uy.kohesive.injekt.injectLazy
 import java.net.URL
 import java.text.ParseException
 import java.text.SimpleDateFormat
@@ -156,21 +156,26 @@ class Mangahub : ParsedHttpSource() {
 
         val slug = chapter.url.substringAfter("chapter/").substringBefore("/")
         val number = chapter.url.substringAfter("chapter-").removeSuffix("/")
-        val body = RequestBody.create(null, "{\"query\":\"{chapter(x:m01,slug:\\\"$slug\\\",number:$number){id,title,mangaID,number,slug,date,pages,noAd,manga{id,title,slug,mainSlug,author,isWebtoon,isYaoi,isPorn,isSoftPorn,unauthFile,isLicensed}}}\"}")
+        val body =
+            "{\"query\":\"{chapter(x:m01,slug:\\\"$slug\\\",number:$number){id,title,mangaID,number,slug,date,pages,noAd,manga{id,title,slug,mainSlug,author,isWebtoon,isYaoi,isPorn,isSoftPorn,unauthFile,isLicensed}}}\"}".toRequestBody(
+                null
+            )
 
         return POST("https://api.mghubcdn.com/graphql", jsonHeaders, body)
     }
 
-    private val gson = Gson()
+    private val json: Json by injectLazy()
 
     override fun pageListParse(response: Response): List<Page> {
         val cdn = "https://img.mghubcdn.com/file/imghub"
 
-        return gson.fromJson<JsonObject>(response.body!!.string())["data"]["chapter"]["pages"].string
+        return json.decodeFromString<JsonObject>(response.body!!.string())["data"]!!
+            .jsonObject["chapter"]!!
+            .jsonObject["pages"]!!.jsonPrimitive.content
             .removeSurrounding("\"").replace("\\", "")
             .let { cleaned ->
-                val jsonObject = gson.fromJson<JsonObject>(cleaned)
-                jsonObject.keys().map { key -> jsonObject[key].string }
+                val jsonObject = json.decodeFromString<JsonObject>(cleaned)
+                jsonObject.keys.map { key -> jsonObject[key]!!.jsonPrimitive.content }
             }
             .mapIndexed { i, tail -> Page(i, "", "$cdn/$tail") }
     }
diff --git a/src/en/mangarockes/build.gradle b/src/en/mangarockes/build.gradle
index 8a277a004..3c4b6acc5 100644
--- a/src/en/mangarockes/build.gradle
+++ b/src/en/mangarockes/build.gradle
@@ -1,5 +1,6 @@
 apply plugin: 'com.android.application'
 apply plugin: 'kotlin-android'
+apply plugin: 'kotlinx-serialization'
 
 ext {
     extName = 'MangaRock.es'
diff --git a/src/en/mangarockes/src/eu/kanade/tachiyomi/extension/en/mangarockes/MangaRockEs.kt b/src/en/mangarockes/src/eu/kanade/tachiyomi/extension/en/mangarockes/MangaRockEs.kt
index 3395fb19b..ae18d53b5 100644
--- a/src/en/mangarockes/src/eu/kanade/tachiyomi/extension/en/mangarockes/MangaRockEs.kt
+++ b/src/en/mangarockes/src/eu/kanade/tachiyomi/extension/en/mangarockes/MangaRockEs.kt
@@ -1,8 +1,5 @@
 package eu.kanade.tachiyomi.extension.en.mangarockes
 
-import com.github.salomonbrys.kotson.fromJson
-import com.google.gson.Gson
-import com.google.gson.JsonArray
 import eu.kanade.tachiyomi.network.GET
 import eu.kanade.tachiyomi.source.model.Filter
 import eu.kanade.tachiyomi.source.model.FilterList
@@ -10,6 +7,11 @@ import eu.kanade.tachiyomi.source.model.Page
 import eu.kanade.tachiyomi.source.model.SChapter
 import eu.kanade.tachiyomi.source.model.SManga
 import eu.kanade.tachiyomi.source.online.ParsedHttpSource
+import kotlinx.serialization.decodeFromString
+import kotlinx.serialization.json.Json
+import kotlinx.serialization.json.JsonArray
+import kotlinx.serialization.json.jsonObject
+import kotlinx.serialization.json.jsonPrimitive
 import okhttp3.HttpUrl.Companion.toHttpUrl
 import okhttp3.MediaType.Companion.toMediaTypeOrNull
 import okhttp3.OkHttpClient
@@ -18,6 +20,7 @@ import okhttp3.Response
 import okhttp3.ResponseBody.Companion.toResponseBody
 import org.jsoup.nodes.Document
 import org.jsoup.nodes.Element
+import uy.kohesive.injekt.injectLazy
 import java.text.SimpleDateFormat
 import java.util.Calendar
 import java.util.Locale
@@ -160,13 +163,13 @@ class MangaRockEs : ParsedHttpSource() {
 
     // Pages
 
-    private val gson by lazy { Gson() }
+    private val json: Json by injectLazy()
 
     override fun pageListParse(response: Response): List<Page> {
         val responseString = response.body!!.string()
         return Regex("""mangaData = (\[.*]);""", RegexOption.IGNORE_CASE).find(responseString)?.groupValues?.get(1)?.let { array ->
-            gson.fromJson<JsonArray>(array)
-                .mapIndexed { i, jsonElement -> Page(i, "", jsonElement.asJsonObject["url"].asString) }
+            json.decodeFromString<JsonArray>(array)
+                .mapIndexed { i, jsonElement -> Page(i, "", jsonElement.jsonObject["url"]!!.jsonPrimitive.content) }
         }
             ?: Regex("""getManga\(\d+, '(http.*)',""").findAll(responseString).toList()
                 .mapIndexed { i, mr -> Page(i, "", mr.groupValues[1]) }
diff --git a/src/en/manhuamanga/src/eu/kanade/tachiyomi/extension/en/manhuamanga/ManhuaManga.kt b/src/en/manhuamanga/src/eu/kanade/tachiyomi/extension/en/manhuamanga/ManhuaManga.kt
index 84f915762..c5e279b02 100644
--- a/src/en/manhuamanga/src/eu/kanade/tachiyomi/extension/en/manhuamanga/ManhuaManga.kt
+++ b/src/en/manhuamanga/src/eu/kanade/tachiyomi/extension/en/manhuamanga/ManhuaManga.kt
@@ -11,7 +11,7 @@ import eu.kanade.tachiyomi.source.online.ParsedHttpSource
 import eu.kanade.tachiyomi.util.asJsoup
 import okhttp3.HttpUrl.Companion.toHttpUrlOrNull
 import okhttp3.Request
-import okhttp3.RequestBody
+import okhttp3.RequestBody.Companion.toRequestBody
 import okhttp3.Response
 import org.jsoup.nodes.Document
 import org.jsoup.nodes.Element
@@ -69,7 +69,7 @@ class ManhuaManga : ParsedHttpSource() {
     protected fun getXhrChapters(mangaId: String): Document {
         val xhrHeaders = headersBuilder().add("Content-Type: application/x-www-form-urlencoded; charset=UTF-8")
             .build()
-        val body = RequestBody.create(null, "action=tw_ajax&type=list_chap&id=$mangaId")
+        val body = "action=tw_ajax&type=list_chap&id=$mangaId".toRequestBody(null)
         return client.newCall(POST("$baseUrl/wp-admin/admin-ajax.php", xhrHeaders, body)).execute().asJsoup()
     }
 
diff --git a/src/en/manhwamanga/src/eu/kanade/tachiyomi/extension/en/manhwamanga/ManhwaManga.kt b/src/en/manhwamanga/src/eu/kanade/tachiyomi/extension/en/manhwamanga/ManhwaManga.kt
index 1b68aff43..2100f5c70 100644
--- a/src/en/manhwamanga/src/eu/kanade/tachiyomi/extension/en/manhwamanga/ManhwaManga.kt
+++ b/src/en/manhwamanga/src/eu/kanade/tachiyomi/extension/en/manhwamanga/ManhwaManga.kt
@@ -11,7 +11,7 @@ import eu.kanade.tachiyomi.source.online.ParsedHttpSource
 import eu.kanade.tachiyomi.util.asJsoup
 import okhttp3.HttpUrl.Companion.toHttpUrlOrNull
 import okhttp3.Request
-import okhttp3.RequestBody
+import okhttp3.RequestBody.Companion.toRequestBody
 import okhttp3.Response
 import org.jsoup.nodes.Document
 import org.jsoup.nodes.Element
@@ -69,7 +69,7 @@ class ManhwaManga : ParsedHttpSource() {
     protected fun getXhrChapters(mangaId: String): Document {
         val xhrHeaders = headersBuilder().add("Content-Type: application/x-www-form-urlencoded; charset=UTF-8")
             .build()
-        val body = RequestBody.create(null, "action=tw_ajax&type=list_chap&id=$mangaId")
+        val body = "action=tw_ajax&type=list_chap&id=$mangaId".toRequestBody(null)
         return client.newCall(POST("$baseUrl/wp-admin/admin-ajax.php", xhrHeaders, body)).execute().asJsoup()
     }
 
diff --git a/src/en/readmanhwa/build.gradle b/src/en/readmanhwa/build.gradle
index 8d6ce23d1..eaefd9446 100644
--- a/src/en/readmanhwa/build.gradle
+++ b/src/en/readmanhwa/build.gradle
@@ -1,5 +1,6 @@
 apply plugin: 'com.android.application'
 apply plugin: 'kotlin-android'
+apply plugin: 'kotlinx-serialization'
 
 ext {
     extName = 'ReadManhwa'
diff --git a/src/en/readmanhwa/src/eu/kanade/tachiyomi/extension/en/readmanhwa/ReadManhwa.kt b/src/en/readmanhwa/src/eu/kanade/tachiyomi/extension/en/readmanhwa/ReadManhwa.kt
index 0f6125c4b..e775756ce 100644
--- a/src/en/readmanhwa/src/eu/kanade/tachiyomi/extension/en/readmanhwa/ReadManhwa.kt
+++ b/src/en/readmanhwa/src/eu/kanade/tachiyomi/extension/en/readmanhwa/ReadManhwa.kt
@@ -2,14 +2,6 @@ package eu.kanade.tachiyomi.extension.en.readmanhwa
 
 import android.app.Application
 import android.content.SharedPreferences
-import com.github.salomonbrys.kotson.fromJson
-import com.github.salomonbrys.kotson.get
-import com.github.salomonbrys.kotson.int
-import com.github.salomonbrys.kotson.nullString
-import com.github.salomonbrys.kotson.string
-import com.google.gson.Gson
-import com.google.gson.JsonArray
-import com.google.gson.JsonObject
 import eu.kanade.tachiyomi.network.GET
 import eu.kanade.tachiyomi.network.asObservableSuccess
 import eu.kanade.tachiyomi.source.ConfigurableSource
@@ -20,6 +12,15 @@ import eu.kanade.tachiyomi.source.model.Page
 import eu.kanade.tachiyomi.source.model.SChapter
 import eu.kanade.tachiyomi.source.model.SManga
 import eu.kanade.tachiyomi.source.online.HttpSource
+import kotlinx.serialization.decodeFromString
+import kotlinx.serialization.json.Json
+import kotlinx.serialization.json.JsonArray
+import kotlinx.serialization.json.JsonObject
+import kotlinx.serialization.json.contentOrNull
+import kotlinx.serialization.json.int
+import kotlinx.serialization.json.jsonArray
+import kotlinx.serialization.json.jsonObject
+import kotlinx.serialization.json.jsonPrimitive
 import okhttp3.Headers
 import okhttp3.HttpUrl.Companion.toHttpUrlOrNull
 import okhttp3.OkHttpClient
@@ -28,6 +29,7 @@ import okhttp3.Response
 import rx.Observable
 import uy.kohesive.injekt.Injekt
 import uy.kohesive.injekt.api.get
+import uy.kohesive.injekt.injectLazy
 import java.text.SimpleDateFormat
 import java.util.Calendar
 import java.util.Locale
@@ -54,20 +56,20 @@ class ReadManhwa : ConfigurableSource, HttpSource() {
 
     override val client: OkHttpClient = network.cloudflareClient
 
-    private val gson = Gson()
+    private val json: Json by injectLazy()
 
     private fun parseMangaFromJson(response: Response): MangasPage {
-        val jsonObject = gson.fromJson<JsonObject>(response.body!!.string())
+        val jsonObject = json.decodeFromString<JsonObject>(response.body!!.string())
 
-        val mangas = jsonObject["data"].asJsonArray.map { json ->
+        val mangas = jsonObject["data"]!!.jsonArray.map { json ->
             SManga.create().apply {
-                title = json["title"].string
-                thumbnail_url = json["image_url"].string
-                url = json["slug"].string
+                title = json.jsonObject["title"]!!.jsonPrimitive.content
+                thumbnail_url = json.jsonObject["image_url"]!!.jsonPrimitive.content
+                url = json.jsonObject["slug"]!!.jsonPrimitive.content
             }
         }
 
-        return MangasPage(mangas, jsonObject["current_page"].int < jsonObject["last_page"].int)
+        return MangasPage(mangas, jsonObject["current_page"]!!.jsonPrimitive.int < jsonObject["last_page"]!!.jsonPrimitive.int)
     }
     private fun getMangaUrl(url: String): String {
         return url.toHttpUrlOrNull()!!.newBuilder()
@@ -159,15 +161,15 @@ class ReadManhwa : ConfigurableSource, HttpSource() {
     }
 
     override fun mangaDetailsParse(response: Response): SManga {
-        val jsonObject = gson.fromJson<JsonObject>(response.body!!.string())
+        val jsonObject = json.decodeFromString<JsonObject>(response.body!!.string())
 
         return SManga.create().apply {
-            description = jsonObject["description"].nullString
-            status = jsonObject["status"].nullString.toStatus()
-            thumbnail_url = jsonObject["image_url"].nullString
-            genre = try { jsonObject["tags"].asJsonArray.joinToString { it["name"].string } } catch (_: Exception) { null }
-            artist = try { jsonObject["artists"].asJsonArray.joinToString { it["name"].string } } catch (_: Exception) { null }
-            author = try { jsonObject["authors"].asJsonArray.joinToString { it["name"].string } } catch (_: Exception) { null }
+            description = jsonObject["description"]!!.jsonPrimitive.contentOrNull
+            status = jsonObject["status"]!!.jsonPrimitive.contentOrNull.toStatus()
+            thumbnail_url = jsonObject["image_url"]!!.jsonPrimitive.contentOrNull
+            genre = try { jsonObject["tags"]!!.jsonArray.joinToString { it.jsonObject["name"]!!.jsonPrimitive.content } } catch (_: Exception) { null }
+            artist = try { jsonObject["artists"]!!.jsonArray.joinToString { it.jsonObject["name"]!!.jsonPrimitive.content } } catch (_: Exception) { null }
+            author = try { jsonObject["authors"]!!.jsonArray.joinToString { it.jsonObject["name"]!!.jsonPrimitive.content } } catch (_: Exception) { null }
         }
     }
 
@@ -193,11 +195,11 @@ class ReadManhwa : ConfigurableSource, HttpSource() {
     }
 
     private fun chapterListParse(response: Response, titleSlug: String): List<SChapter> {
-        return gson.fromJson<JsonArray>(response.body!!.string()).map { json ->
+        return json.decodeFromString<JsonArray>(response.body!!.string()).map { json ->
             SChapter.create().apply {
-                name = json["name"].string
-                url = "$titleSlug/${json["slug"].string}"
-                date_upload = json["added_at"].string.let { dateString ->
+                name = json.jsonObject["name"]!!.jsonPrimitive.content
+                url = "$titleSlug/${json.jsonObject["slug"]!!.jsonPrimitive.content}"
+                date_upload = json.jsonObject["added_at"]!!.jsonPrimitive.content.let { dateString ->
                     if (dateString.contains("ago")) {
                         val trimmedDate = dateString.substringBefore(" ago").removeSuffix("s").split(" ")
                         val calendar = Calendar.getInstance()
@@ -225,8 +227,8 @@ class ReadManhwa : ConfigurableSource, HttpSource() {
     }
 
     override fun pageListParse(response: Response): List<Page> {
-        return gson.fromJson<JsonObject>(response.body!!.string())["images"].asJsonArray.mapIndexed { i, json ->
-            Page(i, "", json["source_url"].string)
+        return json.decodeFromString<JsonObject>(response.body!!.string())["images"]!!.jsonArray.mapIndexed { i, json ->
+            Page(i, "", json.jsonObject["source_url"]!!.jsonPrimitive.content)
         }
     }
 
diff --git a/src/es/doujinyang/src/eu/kanade/tachiyomi/extension/es/doujinyang/DoujinYang.kt b/src/es/doujinyang/src/eu/kanade/tachiyomi/extension/es/doujinyang/DoujinYang.kt
index d11bce40c..073c8ea75 100644
--- a/src/es/doujinyang/src/eu/kanade/tachiyomi/extension/es/doujinyang/DoujinYang.kt
+++ b/src/es/doujinyang/src/eu/kanade/tachiyomi/extension/es/doujinyang/DoujinYang.kt
@@ -12,7 +12,7 @@ import eu.kanade.tachiyomi.source.model.SManga
 import eu.kanade.tachiyomi.source.online.ParsedHttpSource
 import eu.kanade.tachiyomi.util.asJsoup
 import okhttp3.Request
-import okhttp3.RequestBody
+import okhttp3.RequestBody.Companion.toRequestBody
 import okhttp3.Response
 import org.jsoup.nodes.Document
 import org.jsoup.nodes.Element
@@ -131,7 +131,7 @@ class DoujinYang : ParsedHttpSource() {
         return POST(
             baseUrl + chapter.url,
             headersBuilder().add("Content-Type", "application/x-www-form-urlencoded").build(),
-            RequestBody.create(null, "info")
+            "info".toRequestBody(null)
         )
     }
 
diff --git a/src/es/kumanga/src/eu/kanade/tachiyomi/extension/es/kumanga/Kumanga.kt b/src/es/kumanga/src/eu/kanade/tachiyomi/extension/es/kumanga/Kumanga.kt
index cd169397c..3a4ea4084 100755
--- a/src/es/kumanga/src/eu/kanade/tachiyomi/extension/es/kumanga/Kumanga.kt
+++ b/src/es/kumanga/src/eu/kanade/tachiyomi/extension/es/kumanga/Kumanga.kt
@@ -1,7 +1,6 @@
 package eu.kanade.tachiyomi.extension.es.kumanga
 
 import android.util.Base64
-import com.github.salomonbrys.kotson.jsonObject
 import eu.kanade.tachiyomi.network.GET
 import eu.kanade.tachiyomi.network.POST
 import eu.kanade.tachiyomi.source.model.Filter
diff --git a/src/ru/comx/build.gradle b/src/ru/comx/build.gradle
index f6a6373d1..420a183e7 100644
--- a/src/ru/comx/build.gradle
+++ b/src/ru/comx/build.gradle
@@ -1,5 +1,6 @@
 apply plugin: 'com.android.application'
 apply plugin: 'kotlin-android'
+apply plugin: 'kotlinx-serialization'
 
 ext {
     extName = 'ComX'
diff --git a/src/ru/comx/src/eu/kanade/tachiyomi/extension/ru/comx/ComX.kt b/src/ru/comx/src/eu/kanade/tachiyomi/extension/ru/comx/ComX.kt
index 860f5a997..e0691b3f2 100644
--- a/src/ru/comx/src/eu/kanade/tachiyomi/extension/ru/comx/ComX.kt
+++ b/src/ru/comx/src/eu/kanade/tachiyomi/extension/ru/comx/ComX.kt
@@ -1,9 +1,5 @@
 package eu.kanade.tachiyomi.extension.ru.comx
 
-import com.github.salomonbrys.kotson.get
-import com.github.salomonbrys.kotson.nullArray
-import com.github.salomonbrys.kotson.obj
-import com.google.gson.JsonParser
 import eu.kanade.tachiyomi.lib.ratelimit.RateLimitInterceptor
 import eu.kanade.tachiyomi.network.GET
 import eu.kanade.tachiyomi.network.POST
@@ -15,6 +11,12 @@ import eu.kanade.tachiyomi.source.model.SChapter
 import eu.kanade.tachiyomi.source.model.SManga
 import eu.kanade.tachiyomi.source.online.ParsedHttpSource
 import eu.kanade.tachiyomi.util.asJsoup
+import kotlinx.serialization.decodeFromString
+import kotlinx.serialization.json.Json
+import kotlinx.serialization.json.JsonObject
+import kotlinx.serialization.json.jsonArray
+import kotlinx.serialization.json.jsonObject
+import kotlinx.serialization.json.jsonPrimitive
 import okhttp3.FormBody
 import okhttp3.Headers
 import okhttp3.HttpUrl.Companion.toHttpUrlOrNull
@@ -23,12 +25,16 @@ import okhttp3.Request
 import okhttp3.Response
 import org.jsoup.nodes.Document
 import org.jsoup.nodes.Element
+import uy.kohesive.injekt.injectLazy
 import java.text.SimpleDateFormat
 import java.util.Date
 import java.util.Locale
 import java.util.concurrent.TimeUnit
 
 class ComX : ParsedHttpSource() {
+
+    private val json: Json by injectLazy()
+
     override val name = "Com-x"
 
     override val baseUrl = "https://com-x.life"
@@ -186,13 +192,13 @@ class ComX : ParsedHttpSource() {
             .substringBefore("</script>")
             .substringBeforeLast(";")
 
-        val data = JsonParser.parseString(dataStr).obj
-        val chaptersList = data["chapters"].nullArray
+        val data = json.decodeFromString<JsonObject>(dataStr)
+        val chaptersList = data["chapters"]?.jsonArray
         val chapters: List<SChapter>? = chaptersList?.map {
             val chapter = SChapter.create()
-            chapter.name = it["title"].asString
-            chapter.date_upload = parseDate(it["date"].asString)
-            chapter.setUrlWithoutDomain("/readcomix/" + data["news_id"] + "/" + it["id"] + ".html")
+            chapter.name = it.jsonObject["title"]!!.jsonPrimitive.content
+            chapter.date_upload = parseDate(it.jsonObject["date"]!!.jsonPrimitive.content)
+            chapter.setUrlWithoutDomain("/readcomix/" + data["news_id"] + "/" + it.jsonObject["id"]!!.jsonPrimitive.content + ".html")
             chapter
         }
         return chapters ?: emptyList()
diff --git a/src/ru/libmanga/build.gradle b/src/ru/libmanga/build.gradle
index d8604de3f..142032cff 100644
--- a/src/ru/libmanga/build.gradle
+++ b/src/ru/libmanga/build.gradle
@@ -1,5 +1,6 @@
 apply plugin: 'com.android.application'
 apply plugin: 'kotlin-android'
+apply plugin: 'kotlinx-serialization'
 
 ext {
     extName = 'MangaLib'
diff --git a/src/ru/libmanga/src/eu/kanade/tachiyomi/extension/ru/libmanga/LibManga.kt b/src/ru/libmanga/src/eu/kanade/tachiyomi/extension/ru/libmanga/LibManga.kt
index 01548c165..9b6b6b497 100644
--- a/src/ru/libmanga/src/eu/kanade/tachiyomi/extension/ru/libmanga/LibManga.kt
+++ b/src/ru/libmanga/src/eu/kanade/tachiyomi/extension/ru/libmanga/LibManga.kt
@@ -5,18 +5,6 @@ import android.content.SharedPreferences
 import android.widget.Toast
 import androidx.preference.ListPreference
 import androidx.preference.PreferenceScreen
-import com.github.salomonbrys.kotson.array
-import com.github.salomonbrys.kotson.get
-import com.github.salomonbrys.kotson.int
-import com.github.salomonbrys.kotson.nullArray
-import com.github.salomonbrys.kotson.nullInt
-import com.github.salomonbrys.kotson.nullString
-import com.github.salomonbrys.kotson.obj
-import com.github.salomonbrys.kotson.string
-import com.github.salomonbrys.kotson.toMap
-import com.google.gson.JsonArray
-import com.google.gson.JsonElement
-import com.google.gson.JsonParser
 import eu.kanade.tachiyomi.lib.ratelimit.RateLimitInterceptor
 import eu.kanade.tachiyomi.network.GET
 import eu.kanade.tachiyomi.network.POST
@@ -30,6 +18,17 @@ import eu.kanade.tachiyomi.source.model.SChapter
 import eu.kanade.tachiyomi.source.model.SManga
 import eu.kanade.tachiyomi.source.online.HttpSource
 import eu.kanade.tachiyomi.util.asJsoup
+import kotlinx.serialization.decodeFromString
+import kotlinx.serialization.json.Json
+import kotlinx.serialization.json.JsonArray
+import kotlinx.serialization.json.JsonElement
+import kotlinx.serialization.json.JsonObject
+import kotlinx.serialization.json.contentOrNull
+import kotlinx.serialization.json.int
+import kotlinx.serialization.json.intOrNull
+import kotlinx.serialization.json.jsonArray
+import kotlinx.serialization.json.jsonObject
+import kotlinx.serialization.json.jsonPrimitive
 import okhttp3.Headers
 import okhttp3.HttpUrl.Companion.toHttpUrlOrNull
 import okhttp3.OkHttpClient
@@ -39,12 +38,15 @@ import org.jsoup.nodes.Element
 import rx.Observable
 import uy.kohesive.injekt.Injekt
 import uy.kohesive.injekt.api.get
+import uy.kohesive.injekt.injectLazy
 import java.text.SimpleDateFormat
 import java.util.Locale
 import java.util.concurrent.TimeUnit
 
 class LibManga : ConfigurableSource, HttpSource() {
 
+    private val json: Json by injectLazy()
+    
     private val preferences: SharedPreferences by lazy {
         Injekt.get<Application>().getSharedPreferences("source_${id}_2", 0x0000)
     }
@@ -72,8 +74,6 @@ class LibManga : ConfigurableSource, HttpSource() {
         add("Referer", baseUrl)
     }
 
-    private val jsonParser = JsonParser()
-
     override fun latestUpdatesRequest(page: Int) = GET(baseUrl, headers)
 
     private val latestUpdatesSelector = "div.updates__item"
@@ -135,21 +135,21 @@ class LibManga : ConfigurableSource, HttpSource() {
 
     override fun popularMangaParse(response: Response): MangasPage {
         val resBody = response.body!!.string()
-        val result = jsonParser.parse(resBody).obj
-        val items = result["items"]
-        val popularMangas = items["data"].nullArray?.map { popularMangaFromElement(it) }
+        val result = json.decodeFromString<JsonObject>(resBody)
+        val items = result["items"]!!.jsonObject
+        val popularMangas = items["data"]?.jsonArray?.map { popularMangaFromElement(it) }
 
         if (popularMangas != null) {
-            val hasNextPage = items["next_page_url"].nullString != null
+            val hasNextPage = items["next_page_url"]?.jsonPrimitive?.contentOrNull != null
             return MangasPage(popularMangas, hasNextPage)
         }
         return MangasPage(emptyList(), false)
     }
 
     private fun popularMangaFromElement(el: JsonElement) = SManga.create().apply {
-        val slug = el["slug"].string
-        val cover = el["cover"].string
-        title = if (titleLanguage.equals("rus")) el["rus_name"].string else el["name"].string
+        val slug = el.jsonObject["slug"]!!.jsonPrimitive.content
+        val cover = el.jsonObject["cover"]!!.jsonPrimitive.content
+        title = if (titleLanguage.equals("rus")) el.jsonObject["rus_name"]!!.jsonPrimitive.content else el.jsonObject["name"]!!.jsonPrimitive.content
         thumbnail_url = "$COVER_URL/uploads/cover/$slug/cover/${cover}_250x350.jpg"
         url = "/$slug"
     }
@@ -232,17 +232,17 @@ class LibManga : ConfigurableSource, HttpSource() {
             .substringBefore("window._SITE_COLOR_")
             .substringBeforeLast(";")
 
-        val data = jsonParser.parse(dataStr).obj
-        val chaptersList = data["chapters"]["list"].nullArray
-        val slug = data["manga"]["slug"].string
-        val branches = data["chapters"]["branches"].array.reversed()
+        val data = json.decodeFromString<JsonObject>(dataStr)
+        val chaptersList = data["chapters"]!!.jsonObject["list"]?.jsonArray
+        val slug = data["manga"]!!.jsonObject["slug"]!!.jsonPrimitive.content
+        val branches = data["chapters"]!!.jsonObject["branches"]!!.jsonArray.reversed()
         val sortingList = preferences.getString(SORTING_PREF, "ms_mixing")
 
         val chapters: List<SChapter>? = if (branches.isNotEmpty() && !sortingList.equals("ms_mixing")) {
             sortChaptersByTranslator(sortingList, chaptersList, slug, branches)
         } else {
             chaptersList
-                ?.filter { it["status"].nullInt != 2 }
+                ?.filter { it.jsonObject["status"]?.jsonPrimitive?.intOrNull != 2 }
                 ?.map { chapterFromElement(it, sortingList, slug) }
         }
 
@@ -256,9 +256,9 @@ class LibManga : ConfigurableSource, HttpSource() {
             "ms_combining" -> {
                 val tempChaptersList = mutableListOf<SChapter>()
                 for (currentBranch in branches.withIndex()) {
-                    val teamId = branches[currentBranch.index]["id"].int
+                    val teamId = branches[currentBranch.index].jsonObject["id"]!!.jsonPrimitive.int
                     chapters = chaptersList
-                        ?.filter { it["branch_id"].nullInt == teamId && it["status"].nullInt != 2 }
+                        ?.filter { it.jsonObject["branch_id"]?.jsonPrimitive?.intOrNull == teamId && it.jsonObject["status"]?.jsonPrimitive?.intOrNull != 2 }
                         ?.map { chapterFromElement(it, sortingList, slug, teamId, branches) }
                     chapters?.let { tempChaptersList.addAll(it) }
                 }
@@ -267,26 +267,26 @@ class LibManga : ConfigurableSource, HttpSource() {
             "ms_largest" -> {
                 val sizesChaptersLists = mutableListOf<Int>()
                 for (currentBranch in branches.withIndex()) {
-                    val teamId = branches[currentBranch.index]["id"].int
+                    val teamId = branches[currentBranch.index].jsonObject["id"]!!.jsonPrimitive.int
                     val chapterSize = chaptersList
-                        ?.filter { it["branch_id"].nullInt == teamId }!!.size
+                        ?.filter { it.jsonObject["branch_id"]?.jsonPrimitive?.intOrNull == teamId }!!.size
                     sizesChaptersLists.add(chapterSize)
                 }
                 val max = sizesChaptersLists.indexOfFirst { it == sizesChaptersLists.maxOrNull() ?: 0 }
-                val teamId = branches[max]["id"].int
+                val teamId = branches[max].jsonObject["id"]!!.jsonPrimitive.int
 
                 chapters = chaptersList
-                    ?.filter { it["branch_id"].nullInt == teamId && it["status"].nullInt != 2 }
+                    ?.filter { it.jsonObject["branch_id"]?.jsonPrimitive?.intOrNull == teamId && it.jsonObject["status"]?.jsonPrimitive?.intOrNull != 2 }
                     ?.map { chapterFromElement(it, sortingList, slug, teamId, branches) }
             }
             "ms_active" -> {
                 for (currentBranch in branches.withIndex()) {
-                    val teams = branches[currentBranch.index]["teams"].array
+                    val teams = branches[currentBranch.index].jsonObject["teams"]!!.jsonArray
                     for (currentTeam in teams.withIndex()) {
-                        if (teams[currentTeam.index]["is_active"].int == 1) {
-                            val teamId = branches[currentBranch.index]["id"].int
+                        if (teams[currentTeam.index].jsonObject["is_active"]!!.jsonPrimitive.int == 1) {
+                            val teamId = branches[currentBranch.index].jsonObject["id"]!!.jsonPrimitive.int
                             chapters = chaptersList
-                                ?.filter { it["branch_id"].nullInt == teamId && it["status"].nullInt != 2 }
+                                ?.filter { it.jsonObject["branch_id"]?.jsonPrimitive?.intOrNull == teamId && it.jsonObject["status"]?.jsonPrimitive?.intOrNull != 2 }
                                 ?.map { chapterFromElement(it, sortingList, slug, teamId, branches) }
                             break
                         }
@@ -303,23 +303,23 @@ class LibManga : ConfigurableSource, HttpSource() {
     (chapterItem: JsonElement, sortingList: String?, slug: String, teamIdParam: Int? = null, branches: List<JsonElement>? = null): SChapter {
         val chapter = SChapter.create()
 
-        val volume = chapterItem["chapter_volume"].int
-        val number = chapterItem["chapter_number"].string
+        val volume = chapterItem.jsonObject["chapter_volume"]!!.jsonPrimitive.int
+        val number = chapterItem.jsonObject["chapter_number"]!!.jsonPrimitive.content
         val teamId = if (teamIdParam != null) "?bid=$teamIdParam" else ""
 
         val url = "$baseUrl/$slug/v$volume/c$number$teamId"
 
         chapter.setUrlWithoutDomain(url)
 
-        val nameChapter = chapterItem["chapter_name"].nullString
+        val nameChapter = chapterItem.jsonObject["chapter_name"]?.jsonPrimitive?.contentOrNull
         val fullNameChapter = "Том $volume. Глава $number"
 
         if (!sortingList.equals("ms_mixing")) {
-            chapter.scanlator = branches?.let { getScanlatorTeamName(it, chapterItem) } ?: chapterItem["username"].string
+            chapter.scanlator = branches?.let { getScanlatorTeamName(it, chapterItem) } ?: chapterItem.jsonObject["username"]!!.jsonPrimitive.content
         }
         chapter.name = if (nameChapter.isNullOrBlank()) fullNameChapter else "$fullNameChapter - $nameChapter"
         chapter.date_upload = SimpleDateFormat("yyyy-MM-dd", Locale.US)
-            .parse(chapterItem["chapter_created_at"].string.substringBefore(" "))?.time ?: 0L
+            .parse(chapterItem.jsonObject["chapter_created_at"]!!.jsonPrimitive.content.substringBefore(" "))?.time ?: 0L
 
         return chapter
     }
@@ -327,15 +327,15 @@ class LibManga : ConfigurableSource, HttpSource() {
     private fun getScanlatorTeamName(branches: List<JsonElement>, chapterItem: JsonElement): String? {
         var scanlatorData: String? = null
         for (currentBranch in branches.withIndex()) {
-            val branch = branches[currentBranch.index]
-            val teams = branch["teams"].array
-            if (chapterItem["branch_id"].int == branch["id"].int) {
+            val branch = branches[currentBranch.index].jsonObject
+            val teams = branch["teams"]!!.jsonArray
+            if (chapterItem.jsonObject["branch_id"]!!.jsonPrimitive.int == branch["id"]!!.jsonPrimitive.int) {
                 for (currentTeam in teams.withIndex()) {
-                    val team = teams[currentTeam.index]
-                    val scanlatorId = chapterItem["chapter_scanlator_id"].int
-                    scanlatorData = if ((scanlatorId == team["id"].int) ||
-                        (scanlatorId == 0 && team["is_active"].int == 1)
-                    ) team["name"].string else branch["teams"][0]["name"].string
+                    val team = teams[currentTeam.index].jsonObject
+                    val scanlatorId = chapterItem.jsonObject["chapter_scanlator_id"]!!.jsonPrimitive.int
+                    scanlatorData = if ((scanlatorId == team.jsonObject["id"]!!.jsonPrimitive.int) ||
+                        (scanlatorId == 0 && team["is_active"]!!.jsonPrimitive.int == 1)
+                    ) team["name"]!!.jsonPrimitive.content else branch["teams"]!!.jsonArray[0].jsonObject["name"]!!.jsonPrimitive.content
                 }
             }
         }
@@ -371,11 +371,11 @@ class LibManga : ConfigurableSource, HttpSource() {
             .split(";")
             .first()
 
-        val chapInfoJson = jsonParser.parse(chapInfo).obj
-        val servers = chapInfoJson["servers"].asJsonObject.toMap()
-        val defaultServer: String = chapInfoJson["img"]["server"].string
+        val chapInfoJson = json.decodeFromString<JsonObject>(chapInfo)
+        val servers = chapInfoJson["servers"]!!.jsonObject.toMap()
+        val defaultServer: String = chapInfoJson["img"]!!.jsonObject["server"]!!.jsonPrimitive.content
         val autoServer = setOf("secondary", "fourth", defaultServer, "compress")
-        val imgUrl: String = chapInfoJson["img"]["url"].string
+        val imgUrl: String = chapInfoJson["img"]!!.jsonObject["url"]!!.jsonPrimitive.content
 
         val serverToUse = when (this.server) {
             null -> autoServer
@@ -392,15 +392,15 @@ class LibManga : ConfigurableSource, HttpSource() {
             .removePrefix("window.__pg = ")
             .removeSuffix(";")
 
-        val pagesJson = jsonParser.parse(pagesArr).array
+        val pagesJson = json.decodeFromString<JsonArray>(pagesArr)
         val pages = mutableListOf<Page>()
 
         pagesJson.forEach { page ->
             val keys = servers.keys.filter { serverToUse.indexOf(it) >= 0 }.sortedBy { serverToUse.indexOf(it) }
             val serversUrls = keys.map {
-                servers[it]?.string + imgUrl + page["u"].string
+                servers[it]?.jsonPrimitive?.contentOrNull + imgUrl + page.jsonObject["u"]!!.jsonPrimitive.content
             }.joinToString(separator = ",,") { it }
-            pages.add(Page(page["p"].int, serversUrls))
+            pages.add(Page(page.jsonObject["p"]!!.jsonPrimitive.int, serversUrls))
         }
 
         return pages
@@ -523,7 +523,7 @@ class LibManga : ConfigurableSource, HttpSource() {
             )
                 .execute().body!!.string()
 
-            val jsonList = jsonParser.parse(popup).array
+            val jsonList = json.decodeFromString<JsonArray>(popup)
             jsonList.forEach {
                 mangas.add(popularMangaFromElement(it))
             }
diff --git a/src/ru/mangaonlinebiz/build.gradle b/src/ru/mangaonlinebiz/build.gradle
index 90419d33a..72407e832 100644
--- a/src/ru/mangaonlinebiz/build.gradle
+++ b/src/ru/mangaonlinebiz/build.gradle
@@ -1,5 +1,6 @@
 apply plugin: 'com.android.application'
 apply plugin: 'kotlin-android'
+apply plugin: 'kotlinx-serialization'
 
 ext {
     extName = 'Mangaonlinebiz'
diff --git a/src/ru/mangaonlinebiz/src/eu/kanade/tachiyomi/extension/ru/mangaonlinebiz/MangaOnlineBiz.kt b/src/ru/mangaonlinebiz/src/eu/kanade/tachiyomi/extension/ru/mangaonlinebiz/MangaOnlineBiz.kt
index a78755e95..ad3983747 100644
--- a/src/ru/mangaonlinebiz/src/eu/kanade/tachiyomi/extension/ru/mangaonlinebiz/MangaOnlineBiz.kt
+++ b/src/ru/mangaonlinebiz/src/eu/kanade/tachiyomi/extension/ru/mangaonlinebiz/MangaOnlineBiz.kt
@@ -1,10 +1,5 @@
 package eu.kanade.tachiyomi.extension.ru.mangaonlinebiz
 
-import com.github.salomonbrys.kotson.float
-import com.github.salomonbrys.kotson.forEach
-import com.github.salomonbrys.kotson.string
-import com.google.gson.JsonObject
-import com.google.gson.JsonParser
 import eu.kanade.tachiyomi.network.GET
 import eu.kanade.tachiyomi.source.model.Filter
 import eu.kanade.tachiyomi.source.model.FilterList
@@ -13,15 +8,27 @@ import eu.kanade.tachiyomi.source.model.Page
 import eu.kanade.tachiyomi.source.model.SChapter
 import eu.kanade.tachiyomi.source.model.SManga
 import eu.kanade.tachiyomi.source.online.ParsedHttpSource
+import kotlinx.serialization.decodeFromString
+import kotlinx.serialization.json.Json
+import kotlinx.serialization.json.JsonArray
+import kotlinx.serialization.json.JsonObject
+import kotlinx.serialization.json.float
+import kotlinx.serialization.json.jsonArray
+import kotlinx.serialization.json.jsonObject
+import kotlinx.serialization.json.jsonPrimitive
 import okhttp3.Headers
 import okhttp3.Request
 import okhttp3.Response
 import org.jsoup.nodes.Document
 import org.jsoup.nodes.Element
+import uy.kohesive.injekt.injectLazy
 import java.text.SimpleDateFormat
 import java.util.Locale
 
 class MangaOnlineBiz : ParsedHttpSource() {
+
+    private val json: Json by injectLazy()
+
     override val name = "MangaOnlineBiz"
 
     override val baseUrl = "https://manga-online.biz"
@@ -68,15 +75,14 @@ class MangaOnlineBiz : ParsedHttpSource() {
             return popularMangaParse(response)
         }
         val jsonData = response.body!!.string()
-        val json = JsonParser().parse(jsonData).asJsonObject
-        val results = json.getAsJsonArray("results")
+        val results = json.decodeFromString<JsonObject>(jsonData)["results"]!!.jsonArray
         val mangas = mutableListOf<SManga>()
         results.forEach {
-            val element = it.asJsonObject
+            val element = it.jsonObject
             val manga = SManga.create()
-            manga.setUrlWithoutDomain(element.get("url").string)
-            manga.title = element.get("title").string.split("/").first()
-            val image = element.get("image").string
+            manga.setUrlWithoutDomain(element["url"]!!.jsonPrimitive.content)
+            manga.title = element["title"]!!.jsonPrimitive.content.split("/").first()
+            val image = element["image"]!!.jsonPrimitive.content
             if (image.startsWith("http")) {
                 manga.thumbnail_url = image
             } else {
@@ -130,10 +136,9 @@ class MangaOnlineBiz : ParsedHttpSource() {
 
         val jsonData = html.split("App.Collection.MangaChapter(").last().split("]);").first() + "]"
         val mangaName = html.split("mangaName: '").last().split("' });").first()
-        val json = JsonParser().parse(jsonData).asJsonArray
         val chapterList = mutableListOf<SChapter>()
-        json.forEach {
-            chapterList.add(chapterFromElement(mangaName, it.asJsonObject))
+        json.decodeFromString<JsonArray>(jsonData).forEach {
+            chapterList.add(chapterFromElement(mangaName, it.jsonObject))
         }
         return chapterList
     }
@@ -142,22 +147,22 @@ class MangaOnlineBiz : ParsedHttpSource() {
 
     private fun chapterFromElement(mangaName: String, element: JsonObject): SChapter {
         val chapter = SChapter.create()
-        chapter.setUrlWithoutDomain("/$mangaName/${element.get("volume").string}/${element.get("number").string})/1")
-        chapter.name = "Том ${element.get("volume").string} - Глава ${element.get("number").string} ${element.get("title").string}"
-        chapter.chapter_number = element.get("number").float
-        chapter.date_upload = SimpleDateFormat("yyyy-MM-dd", Locale.US).parse(element.get("date").string)?.time ?: 0L
+        chapter.setUrlWithoutDomain("/$mangaName/${element["volume"]!!.jsonPrimitive.content}/${element["number"]!!.jsonPrimitive.content})/1")
+        chapter.name = "Том ${element["volume"]!!.jsonPrimitive.content} - Глава ${element["number"]!!.jsonPrimitive.content} ${element["title"]!!.jsonPrimitive.content}"
+        chapter.chapter_number = element["number"]!!.jsonPrimitive.float
+        chapter.date_upload = SimpleDateFormat("yyyy-MM-dd", Locale.US).parse(element["date"]!!.jsonPrimitive.content)?.time ?: 0L
         return chapter
     }
 
     override fun pageListParse(response: Response): List<Page> {
         val html = response.body!!.string()
         val jsonData = html.split("new App.Router.Chapter(").last().split("});").first() + "}"
-        val json = JsonParser().parse(jsonData).asJsonObject
-        val cdnUrl = json.get("srcBaseUrl").string
-        val pages = json.get("pages").asJsonObject
+        val jsonObj = json.decodeFromString<JsonObject>(jsonData)
+        val cdnUrl = jsonObj["srcBaseUrl"]!!.jsonPrimitive.content
+        val pages = jsonObj["pages"]!!.jsonObject
         val resPages = mutableListOf<Page>()
-        pages.forEach { page, jsonElement ->
-            resPages.add(Page(page.toInt(), imageUrl = "$cdnUrl/${jsonElement.asJsonObject.get("src").string}"))
+        pages.entries.forEach { (page, jsonElement) ->
+            resPages.add(Page(page.toInt(), imageUrl = "$cdnUrl/${jsonElement.jsonObject["src"]!!.jsonPrimitive.content}"))
         }
         return resPages
     }
diff --git a/src/ru/risensteam/build.gradle b/src/ru/risensteam/build.gradle
index 0091a0d05..f96cf4b19 100644
--- a/src/ru/risensteam/build.gradle
+++ b/src/ru/risensteam/build.gradle
@@ -1,5 +1,6 @@
 apply plugin: 'com.android.application'
 apply plugin: 'kotlin-android'
+apply plugin: 'kotlinx-serialization'
 
 ext {
     extName = 'Risens Team'
diff --git a/src/ru/risensteam/src/eu/kanade/tachiyomi/extension/ru/risensteam/RisensTeam.kt b/src/ru/risensteam/src/eu/kanade/tachiyomi/extension/ru/risensteam/RisensTeam.kt
index ee8ff6b84..cb2584d98 100644
--- a/src/ru/risensteam/src/eu/kanade/tachiyomi/extension/ru/risensteam/RisensTeam.kt
+++ b/src/ru/risensteam/src/eu/kanade/tachiyomi/extension/ru/risensteam/RisensTeam.kt
@@ -1,14 +1,5 @@
 package eu.kanade.tachiyomi.extension.ru.risensteam
 
-import com.github.salomonbrys.kotson.fromJson
-import com.github.salomonbrys.kotson.get
-import com.github.salomonbrys.kotson.int
-import com.github.salomonbrys.kotson.nullString
-import com.github.salomonbrys.kotson.string
-import com.google.gson.Gson
-import com.google.gson.JsonArray
-import com.google.gson.JsonElement
-import com.google.gson.JsonObject
 import eu.kanade.tachiyomi.network.GET
 import eu.kanade.tachiyomi.network.POST
 import eu.kanade.tachiyomi.network.asObservableSuccess
@@ -18,11 +9,22 @@ import eu.kanade.tachiyomi.source.model.Page
 import eu.kanade.tachiyomi.source.model.SChapter
 import eu.kanade.tachiyomi.source.model.SManga
 import eu.kanade.tachiyomi.source.online.HttpSource
+import kotlinx.serialization.decodeFromString
+import kotlinx.serialization.json.Json
+import kotlinx.serialization.json.JsonArray
+import kotlinx.serialization.json.JsonElement
+import kotlinx.serialization.json.JsonObject
+import kotlinx.serialization.json.contentOrNull
+import kotlinx.serialization.json.int
+import kotlinx.serialization.json.jsonArray
+import kotlinx.serialization.json.jsonObject
+import kotlinx.serialization.json.jsonPrimitive
 import okhttp3.MediaType.Companion.toMediaTypeOrNull
 import okhttp3.Request
 import okhttp3.RequestBody.Companion.toRequestBody
 import okhttp3.Response
 import rx.Observable
+import uy.kohesive.injekt.injectLazy
 import java.text.ParseException
 import java.text.SimpleDateFormat
 import java.util.Locale
@@ -39,7 +41,7 @@ class RisensTeam : HttpSource() {
 
     override val versionId: Int = 2
 
-    private val gson by lazy { Gson() }
+    private val json: Json by injectLazy()
 
     // Popular (source only returns manga sorted by latest)
 
@@ -49,16 +51,16 @@ class RisensTeam : HttpSource() {
 
     private fun mangaFromJson(json: JsonElement): SManga {
         return SManga.create().apply {
-            url = "${json["id"].int}/${json["furl"].string}"
-            title = json["title"].string
-            thumbnail_url = baseUrl + json["poster"].string
-            description = json["description"].nullString
-            status = try { if (json["active"].int == 1) SManga.ONGOING else SManga.UNKNOWN } catch (_: Exception) { SManga.UNKNOWN }
+            url = "${json.jsonObject["id"]!!.jsonPrimitive.int}/${json.jsonObject["furl"]!!.jsonPrimitive.content}"
+            title = json.jsonObject["title"]!!.jsonPrimitive.content
+            thumbnail_url = baseUrl + json.jsonObject["poster"]!!.jsonPrimitive.content
+            description = json.jsonObject["description"]!!.jsonPrimitive.contentOrNull
+            status = try { if (json.jsonObject["active"]!!.jsonPrimitive.int == 1) SManga.ONGOING else SManga.UNKNOWN } catch (_: Exception) { SManga.UNKNOWN }
         }
     }
 
     override fun popularMangaParse(response: Response): MangasPage {
-        val mangas = gson.fromJson<JsonArray>(response.body!!.string())
+        val mangas = json.decodeFromString<JsonArray>(response.body!!.string())
             .map { json -> mangaFromJson(json) }
 
         return MangasPage(mangas, false)
@@ -98,7 +100,7 @@ class RisensTeam : HttpSource() {
     }
 
     override fun mangaDetailsParse(response: Response): SManga {
-        return mangaFromJson(gson.fromJson<JsonObject>(response.body!!.string()))
+        return mangaFromJson(json.decodeFromString<JsonObject>(response.body!!.string()))
     }
 
     // Chapters
@@ -106,11 +108,11 @@ class RisensTeam : HttpSource() {
     override fun chapterListRequest(manga: SManga): Request = apiMangaDetailsRequest(manga)
 
     override fun chapterListParse(response: Response): List<SChapter> {
-        return gson.fromJson<JsonObject>(response.body!!.string())["entities"].asJsonArray.map { json ->
+        return json.decodeFromString<JsonObject>(response.body!!.string())["entities"]!!.jsonArray.map { json ->
             SChapter.create().apply {
-                url = json["id"].int.toString()
-                name = listOfNotNull(json["label"].nullString, json["name"].nullString).joinToString(" - ")
-                date_upload = json["updated_at"].toDate()
+                url = json.jsonObject["id"]!!.jsonPrimitive.int.toString()
+                name = listOfNotNull(json.jsonObject["label"]!!.jsonPrimitive.contentOrNull, json.jsonObject["name"]!!.jsonPrimitive.contentOrNull).joinToString(" - ")
+                date_upload = json.jsonObject["updated_at"]!!.toDate()
             }
         }
     }
@@ -120,7 +122,7 @@ class RisensTeam : HttpSource() {
     }
 
     private fun JsonElement.toDate(): Long {
-        val date = this.nullString ?: return 0
+        val date = this.jsonPrimitive.contentOrNull ?: return 0
         return try {
             simpleDateFormat.parse(date)?.time ?: 0
         } catch (e: ParseException) {
@@ -135,8 +137,8 @@ class RisensTeam : HttpSource() {
     }
 
     override fun pageListParse(response: Response): List<Page> {
-        return gson.fromJson<JsonArray>(response.body!!.string())
-            .mapIndexed { i, json -> Page(i, "", json.string) }
+        return json.decodeFromString<JsonArray>(response.body!!.string())
+            .mapIndexed { i, json -> Page(i, "", json.jsonPrimitive.content) }
     }
 
     override fun imageUrlParse(response: Response): String = throw UnsupportedOperationException("Not used")
diff --git a/src/th/nekopost/src/eu/kanade/tachiyomi/extension/th/nekopost/model/RawProjectChapter.kt b/src/th/nekopost/src/eu/kanade/tachiyomi/extension/th/nekopost/model/RawProjectChapter.kt
index 0f9825608..fcaeb1823 100644
--- a/src/th/nekopost/src/eu/kanade/tachiyomi/extension/th/nekopost/model/RawProjectChapter.kt
+++ b/src/th/nekopost/src/eu/kanade/tachiyomi/extension/th/nekopost/model/RawProjectChapter.kt
@@ -1,24 +1,24 @@
 package eu.kanade.tachiyomi.extension.th.nekopost.model
 
-import com.google.gson.annotations.SerializedName
+import kotlinx.serialization.SerialName
 import kotlinx.serialization.Serializable
 
 @Serializable
 data class RawProjectChapter(
-    @SerializedName("cu_displayname")
+    @SerialName("cu_displayname")
     val cuDisplayname: String,
-    @SerializedName("nc_chapter_id")
+    @SerialName("nc_chapter_id")
     val ncChapterId: String,
-    @SerializedName("nc_chapter_name")
+    @SerialName("nc_chapter_name")
     val ncChapterName: String,
-    @SerializedName("nc_chapter_no")
+    @SerialName("nc_chapter_no")
     val ncChapterNo: String,
-    @SerializedName("nc_created_date")
+    @SerialName("nc_created_date")
     val ncCreatedDate: String,
-    @SerializedName("nc_data_file")
+    @SerialName("nc_data_file")
     val ncDataFile: String,
-    @SerializedName("nc_owner_id")
+    @SerialName("nc_owner_id")
     val ncOwnerId: String,
-    @SerializedName("nc_provider")
+    @SerialName("nc_provider")
     val ncProvider: String
 )
diff --git a/src/th/nekopost/src/eu/kanade/tachiyomi/extension/th/nekopost/model/RawProjectInfoData.kt b/src/th/nekopost/src/eu/kanade/tachiyomi/extension/th/nekopost/model/RawProjectInfoData.kt
index 55f19a8cf..e83720ac4 100644
--- a/src/th/nekopost/src/eu/kanade/tachiyomi/extension/th/nekopost/model/RawProjectInfoData.kt
+++ b/src/th/nekopost/src/eu/kanade/tachiyomi/extension/th/nekopost/model/RawProjectInfoData.kt
@@ -1,38 +1,38 @@
 package eu.kanade.tachiyomi.extension.th.nekopost.model
 
-import com.google.gson.annotations.SerializedName
+import kotlinx.serialization.SerialName
 import kotlinx.serialization.Serializable
 
 @Serializable
 data class RawProjectInfoData(
-    @SerializedName("artist_name")
+    @SerialName("artist_name")
     val artistName: String,
-    @SerializedName("author_name")
+    @SerialName("author_name")
     val authorName: String,
-    @SerializedName("np_comment")
+    @SerialName("np_comment")
     val npComment: String,
-    @SerializedName("np_created_date")
+    @SerialName("np_created_date")
     val npCreatedDate: String,
-    @SerializedName("np_flag_mature")
+    @SerialName("np_flag_mature")
     val npFlagMature: String,
-    @SerializedName("np_info")
+    @SerialName("np_info")
     val npInfo: String,
-    @SerializedName("np_licenced_by")
+    @SerialName("np_licenced_by")
     val npLicencedBy: String,
-    @SerializedName("np_name")
+    @SerialName("np_name")
     val npName: String,
-    @SerializedName("np_name_link")
+    @SerialName("np_name_link")
     val npNameLink: String,
-    @SerializedName("np_project_id")
+    @SerialName("np_project_id")
     val npProjectId: String,
-    @SerializedName("np_status")
+    @SerialName("np_status")
     val npStatus: String,
-    @SerializedName("np_type")
+    @SerialName("np_type")
     val npType: String,
-    @SerializedName("np_updated_date")
+    @SerialName("np_updated_date")
     val npUpdatedDate: String,
-    @SerializedName("np_view")
+    @SerialName("np_view")
     val npView: String,
-    @SerializedName("np_web")
+    @SerialName("np_web")
     val npWeb: String
 )