Raw JSON body in Retrofit

To send a raw JSON body in String format in Retrofit, I found out I need to include scalar library.

scalar = { module = "com.squareup.retrofit2:converter-scalars", version.ref = "retrofit" }

In my ApiHelper class.

import retrofit2.converter.scalars.ScalarsConverterFactory

object ApiHelper {
  fun getInstance(): Retrofit =
    Retrofit
        .Builder()
        .baseUrl(baseApi)
        .addConverterFactory(ScalarsConverterFactory.create())
        .addConverterFactory(
            json.asConverterFactory(contentType),
        )
        .client(client)
        .build()
}

Important stuff to take note is that, ScalarsConverterFactory.create() needs to be called first before the convert factory, or else it won’t work.

So, sending a raw @Body should now work.

@PATCH("profile")
suspend fun updateUserProfile(
    @Header("Authorization") accessToken: String,
    @Body body: String
): Response<Unit>