Illustrates how a single Itinerary or an array of Itinerary objects can be rendered as a List[Itinerary]

main.scala

package controllers

import play.api._
import play.api.mvc._
import play.api.libs.json._

case class Itinerary(name: String)

object Itinerary {
  implicit val format = Json.format[Itinerary]
}

object Application extends Controller {

  private val itineraryReads = Json.reads[Itinerary]
  private val itinerariesReads: Reads[(List[Itinerary])] = __.read[List[Itinerary]]

  def receiveJson = Action(parse.json) {
    request =>
      val itineraryRead: JsResult[List[Itinerary]] = itinerariesReads.reads(request.body)
        .map(x => JsSuccess(x))
        .recover {
        case _: JsError => itineraryReads.reads(request.body).map(x => List(x))
      }
        .flatMap(x => x)
      Logger.info(s"Received $itineraryRead, ${request.body}")
      Ok("cool")
  }

}