Creating a JSON response from a map with Play Scala 2.3.x

Application.scala

package controllers

import scala.collection.mutable.{Map => MMap}

import play.api.libs.json.{Json, JsValue}
import play.api.mvc._


object Application extends Controller {
  def index = Action {
    var result = MMap("status" -> "ok")
    result += "field" -> "value"
    result += "another" -> "wheeeee"

    Ok(Json.toJson(result.toMap))
  }
}