Map[String,Any] to compact json string using json4s

Question

I am currently extracting some metrics from different data sources and storing them in a map of type Map[String,Any] where the key corresponds to the metric nam

Answer 1

Since you are actually only looking for the JSON string representation of myMap, you can use the Serialization object directly. Here is a small example (if using the native version of json4s change the import to org.json4s.native.Serialization):

EDIT: added formats implicit

 import org.json4s.jackson.Serialization

 implicit val formats = org.json4s.DefaultFormats

 val m: Map[String, Any] = Map(
   "name "-> "joe",
   "children" -> List(
     Map("name" -> "Mary", "age" -> 5),
     Map("name" -> "Mazy", "age" -> 3)
   )
 )
 // prints {"name ":"joe","children":[{"name":"Mary","age":5},{"name":"Mazy","age":3}]}
 println(Serialization.write(m)) 

Answer 2

json4s has method for it.

pretty(render(yourMap))