GitHub - square/retrofit: A type-safe HTTP client for Android and the JVM

Retrofit

Gradle

implementation 'com.squareup.retrofit2:retrofit:2.9.0'

implementation 'com.squareup.retrofit2:converter-gson:2.1.0'

컨버팅 해줘야됨 (json 컨버팅을 위해 필요한 의존성 추가 - 위)

Retrofit retrofit = new Retrofit.Builder()
            .baseUrl("<https://jsonplaceholder.typicode.com/>")
            **.addConverterFactory(GsonConverterFactory.create())**
            .build();