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Scala JSON


JSON with spray-json

spray-json provides an easy way to work with JSON. Using implicit formats, everything happens "behind the scenes":

Make the Library Available with SBT

To manage spray-json with SBT managed library dependencies:

libraryDependencies += "io.spray" %% "spray-json" % "1.3.2"

Note that the last parameter, the version number (1.3.2), may be different in different projects.

The spray-json library is hosted at

Import the Library

import spray.json._
import DefaultJsonProtocol._

The default JSON protocol DefaultJsonProtocol contains formats for all basic types. To provide JSON functionality for custom types, either use convenience builders for formats or write formats explicitly.


// generates an intermediate JSON representation (abstract syntax tree)
val res = """{ "foo": "bar" }""".parseJson // JsValue = {"foo":"bar"}
res.convertTo[Map[String, String]] // Map(foo -> bar)

Write JSON

val values = List("a", "b", "c")
values.toJson.prettyPrint // ["a", "b", "c"]


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