CODEWITHSUNDEEP
jsonscala
ALS
ALS

Reputation: 163

How to get differences between two JSONs?

I want to compare 2 JSON and get all the differences between them in Scala. For example, I would like to compare: 

{"a":"aa", "b": "bb", "c":"cc" }

and

{"c":"cc", "a":"aa", "d":"dd"}

I'd like to get b and d.

Upvotes: 2

Views: 2913

Answers (2)

ALS
ALS

Reputation: 163

Finally, I used JSONassert that does the same thing.

For example,

String expected = "{id:1,name:\"Joe\",friends:[{id:2,name:\"Pat\",pets:[\"dog\"]},{id:3,name:\"Sue\",pets:[\"bird\",\"fish\"]}],pets:[]}";
String actual = "{id:1,name:\"Joe\",friends:[{id:2,name:\"Pat\",pets:[\"dog\"]},{id:3,name:\"Sue\",pets:[\"cat\",\"fish\"]}],pets:[]}"
JSONAssert.assertEquals(expected, actual, false);

it returns 

friends[id=3].pets[]: Expected bird, but not found ; friends[id=3].pets[]: Contains cat, but not expected

source: http://jsonassert.skyscreamer.org/

Upvotes: 4

Isaias Barroso
Isaias Barroso

Reputation: 83

If it isn't a restriction you can use http://json4s.org/ it has a nice diff feature.

Follow an example based on question:

import org.json4s._
import org.json4s.native.JsonMethods._

val json1 = parse("""{"a":"aa", "b":"bb", "c":"cc"}""")
val json2 = parse("""{"c":"cc", "a":"aa", "d":"dd"}""")

val Diff(changed, added, deleted) = json1 diff json2

It will return:

changed: org.json4s.JsonAST.JValue = JNothing
added: org.json4s.JsonAST.JValue = JObject(List((d,JString(dd))))
deleted: org.json4s.JsonAST.JValue = JObject(List((b,JString(bb))))

Best regards

Upvotes: 6

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