Compare json equality in Scala

equality, equals, json, scala

Solution

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.

Problem

How can I compare if two json structures are the same in scala? For example, if I have: ``` { resultCount: 1, results: [ { artistId: 331764459, collectionId: 780609005 } ] } ``` and ``` { results: [ { collectionId: 780609005, artistId: 331764459 } ], resultCount: 1 } ``` They should be considered equal

Original source