How to iterate org.json4s.JsonAST.JValue which is an array of JSON objects to separately work on each object in Scala?

The following is your json.

scala> jsonres2: org.json4s.JValue = JArray(List(JObject(List((abc,JString(1)), (de,JString(1)))),        JObject(List((fgh,JString(2)), (ij,JString(4))))))

There are several ways.

1. use for syntax

   for {  JArray(objList) <- json  JObject(obj) <- objList} {  // do something  val kvList = for ((key, JString(value)) <- obj) yield (key, value)  println("obj : " + kvList.mkString(","))}

2. convert to scala.collection object

   val list = json.values.asInstanceOf[List[Map[String, String]]]//=> list: List[Map[String,String]] = List(Map(abc -> 1, de -> 1), Map(fgh -> 2, ij -> 4))

   or

   implicit val formats = DefaultFormatsval list = json.extract[List[Map[String,String]]]//=> list: List[Map[String,String]] = List(Map(abc -> 1, de -> 1), Map(fgh -> 2, ij -> 4))

   and do something.

   for (obj <- list) println("obj : " + obj.toList.mkString(","))

Both outputs are

obj : (abc,1),(de,1)obj : (fgh,2),(ij,4)

The document of json4s is here.

You should be able to either cast to JArray

val myArray = myVal.asInstanceOf[JArray]myArray.arr // the array

or preferably use a scala match so you can confirm the type is correct.