Check if a key exists in play.api.libs.json.Json

Question

contains like functionality for play.api.libs.json.Json

val data=Map("id" -> "240190", "password" -> "password","email" -> "[email protected]")

data.contains("email")//true


val info=Json.obj("id" -> "240190", "password" -> "password","email" -> "[email protected]")

now how to check info contains email or not?

Answer 1

info.keys.contains("email")

The .keys gives you back a Set with the key values and then you can call the contains method, I'm not sure there's a more direct way to do it.

Answer 2

(info \ "email").asOpt[String].isEmpty

as asOpt would return Optional, we can have isEmpty simple check, this would do what we want.

Answer 3

(info \ "email").asOpt[String] match {
  case Some(data) => println("here is the value for the key email represented by variable data" + data)
  case None => println("email key is not found") 
}