ApiService.kt

interface ApiService {


    @GET("android-code-test/feed.json")
    fun getFeedItems(): Call<List<FeedItem>>

}

FeedItem.kt

data class FeedItem(
    @Expose
    @SerializedName("task_id")
    val task_id: Int,

    @Expose
    @SerializedName("profile_id")
    val profile_id: Int,

    @Expose
    @SerializedName("text")
    val task_text: String?,

    @Expose
    @SerializedName("created_at")
    val created_at: String?,

    @Expose
    @SerializedName("event")
    val event: String?
){

    override fun toString(): String {
        return "FeedItem(task_id=$task_id, profile_id=$profile_id, task_text=$task_text, created_at=$created_at, event=$event)"
    }
}

MainActivity.kt

apiService.getFeedItems().enqueue(object: Callback<List<FeedItem>>{
override fun onFailure(call: Call<List<FeedItem>>, t: Throwable) {
    println("DEBUG: ${t.message}")
    println("DEBUG: ${call.request().body()}")
}

override fun onResponse(
    call: Call<List<FeedItem>>,
    response: Response<List<FeedItem>>
) {
    println("DEBUG: ${response.code()}")
    println("DEBUG: ${call.request().url()}")
    println("DEBUG: ${call.request().body().toString()}")
    println("DEBUG: ${response.raw().body().toString()}")
    println("DEBUG: ${response.body().toString()}")
    println("DEBUG: ${response.errorBody().toString()}")

    for(item in response.body().orEmpty()){
        println("DEBUG: ${item}")
    }

}

})