How to Compare JSON Objects without Regarding Child Order in Java?

Comparing JSON Objects in Java without Regard to Child Order

When unit testing JSON responses from web services, parsing libraries that compare JSON objects while disregarding child order can be invaluable.

Solution: Skyscreamer's JSONAssert

Skyscreamer's JSONAssert library provides a solution. Its "non-strict" mode allows:

• Object extensibility: Expected value {id:1} matches {id:1,moredata:'x'}.
• Loose array ordering: ['dog','cat'] equals ['cat','dog'].

In strict mode, JSONAssert functions similarly to json-lib's test class.

Example Usage

<code class="java">@Test
public void testGetFriends() {
    JSONObject data = getRESTData("/friends/367.json");
    String expected = "{friends:[{id:123,name:\"Corby Page\"}"
        + ",{id:456,name:\"Solomon Duskis\"}]}";
    JSONAssert.assertEquals(expected, data, false); // "false" for non-strict mode
}</code>

Additional Features

• Clear error messages when comparing large JSON objects
• Provides both non-strict and strict comparison modes

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