Pretty print Json in result in Play Framework 2.5

HomeController.scala

package controllers

import javax.inject.{Inject, Singleton}

import play.api.libs.json.Json
import play.api.mvc.{Action, Controller}

@Singleton
class HomeController @Inject() () extends Controller with PrettyJsonOutput {
  def index = Action { implicit request =>
    Ok(Json.obj(
      "greeting" -> "Hello"
    ))
  }
}

PrettyJsonOutput.scala

package controllers

import play.api.http.Writeable
import play.api.libs.json.{JsValue, Json}
import play.api.mvc.Codec

trait PrettyJsonOutput {
  implicit def writeableOf_PrettyJsValue(implicit codec: Codec): Writeable[JsValue] = {
    Writeable(a => codec.encode(Json.prettyPrint(a)))
  }
}

response.json

{
  "greeting" : "Hello"
}