Scala + Play: serialize Map to Json Array

Question

Imagine you have a Map[String, List[String]] that looks like this:

val myMap = Map(
   "ab" -> List("yo", "yo2", "yo3"),
   "cd" -> List("hi", "hi1", "hi2")
 )

if we do Json.toJson(myMap), the resulting JSON is

 {
   "ab" : ["yo", "yo2", "yo3"],
   "cd" : ["hi", "hi1", "hi2"]
 }

Is there a way we could get the outer container to be an array instead of an object? Like

 [
   "ab" : ["yo", "yo2", "yo3"],
   "cd" : ["hi", "hi1", "hi2"]
 ]

I'm not sure that this would be valid Json. Thanks.

No, that is not a valid Json. You can get an array of objects: [ { "ab": [] }, { "cd": [] }]. Is it what you need? — Tyth
– Tyth, Commented Apr 12, 2016 at 15:13

Alexandr Dorokhin · Accepted Answer · 2016-04-12 15:28:34Z

1

The last one is not valid JSON. You could use Json.toJson(myMap.toList) to obtain result as @Tyth has answered. Actually Map is similar to Object of JSON format, cause it provides extracting values by key. In case with Array, it's reached over iterate over each element.

edited Apr 12, 2016 at 15:28

answered Apr 12, 2016 at 15:19

Alexandr Dorokhin

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