gistfile1.txt

case class DegreeCoords(lat: Double, lon: Double)

  implicit object NodeDegreeCoords extends Format[Node.DegreeCoords] {
    def reads(json: JsValue) = Node.DegreeCoords(
      (json \ "lat").as[Double],
      (json \ "lng").as[Double]
    )

    def writes(o: Node.DegreeCoords) =
      toJson(Map("lat" -> o.lat, "lng" -> o.lon))
  }

Json.toJson(DegreeCoords(1, 2)).toString