What libraries and tools have you used for developing REST APIs, and which ones do you prefer?

For developing REST APIs on Android, libraries like Retrofit and OkHttp are often used. Retrofit simplifies the creation of HTTP requests and parsing responses, while OkHttp provides reliable network communication. Gson or Moshi are also popular for JSON serialization.

Example of using Retrofit:

interface ApiService {
    @GET("users/{id}")
    suspend fun getUser(@Path("id") userId: String): User
}

val retrofit = Retrofit.Builder()
    .baseUrl("https://api.example.com/")
    .addConverterFactory(GsonConverterFactory.create())
    .build()

val api = retrofit.create(ApiService::class.java)

Among these tools, I prefer Retrofit for its simplicity and flexibility.