A Retrofit 2 Converter.Factory for Kotlin serialization.

DEPRECATED This has moved into Retrofit as a first-party converter. See here for info.

Add a converter factory when building your Retrofit instance using the asConverterFactory extension function:

val contentType = "application/json".toMediaType()
val retrofit = Retrofit.Builder()
    .baseUrl("https://example.com/")
    .addConverterFactory(Json.asConverterFactory(contentType))
    .build()

Response body types (e.g., Call<User>) and @Body types (e.g., @Body user: User) will now use the supplied serializer.

Because Kotlin serialization is so flexible in the types it supports, these converters assume that they can handle all types. If you are mixing this converter with another, you must add this instance last to allow the other converters a chance to see their types.

Gradle:

implementation("com.jakewharton.retrofit:retrofit2-kotlinx-serialization-converter:1.0.0")

Maven:

<dependency>
  <groupId>com.jakewharton.retrofit</groupId>
  <artifactId>retrofit2-kotlinx-serialization-converter</artifactId>
  <version>1.0.0</version>
</dependency>

Snapshots of the development version are available in Sonatype's snapshots repository.

Copyright 2018 Jake Wharton

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

   http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.