Compare json equality in Scala

You can also use scalatest-json

Example:

    it("should fail on slightly different json explaining why") {
      val input = """{"someField": "valid json"}""".stripMargin

      val expected = """{"someField": "different json"}""".stripMargin

      input should matchJson(expected)
    }

When the 2 jsons doesn't match, a nice diff will be display which is quite useful when working with big jsons.

You should be able to simply do json1 == json2, if the json libraries are written correctly. Is that not working for you?

This is with spray-json, although I would expect the same from every json library:

import spray.json._
import DefaultJsonProtocol._
Welcome to Scala version 2.10.4 (OpenJDK 64-Bit Server VM, Java 1.7.0_51).
Type in expressions to have them evaluated.
Type :help for more information.

scala> val json1 = """{ "a": 1, "b": [ { "c":2, "d":3 } ] }""".parseJson
json1: spray.json.JsValue = {"a":1,"b":[{"c":2,"d":3}]}

scala> val json2 = """{ "b": [ { "d":3, "c":2 } ], "a": 1 }""".parseJson
json2: spray.json.JsValue = {"b":[{"d":3,"c":2}],"a":1}

scala> json1 == json2
res1: Boolean = true

Spray-json uses an immutable scala Map to represent a JSON object in the abstract syntax tree resulting from a parse, so it is just Map's equality semantics that make this work.