How do I serialize Map[String, Any] with spray-json? I try
val data = Map("name" -> "John", "age" -> 42)
import spray.json._
import DefaultJsonProtocol._
data.toJson
It says Cannot find JsonWriter or JsonFormat type class for scala.collection.immutable.Map[String,Any]
.
Here's an implicit converter I used to do this task:
implicit object AnyJsonFormat extends JsonFormat[Any] {
def write(x: Any) = x match {
case n: Int => JsNumber(n)
case s: String => JsString(s)
case b: Boolean if b == true => JsTrue
case b: Boolean if b == false => JsFalse
}
def read(value: JsValue) = value match {
case JsNumber(n) => n.intValue()
case JsString(s) => s
case JsTrue => true
case JsFalse => false
}
}
It was adapted from this post in the Spray user group, but I couldn't get and didn't need to write nested Sequences and Maps to Json so I took them out.