Does JSON Compare upload my data?

No. The comparison runs entirely in your browser using JavaScript. Your JSON is never sent to any server.

Can it compare deeply nested JSON?

Yes. The diff is recursive — it traverses nested objects and arrays to find every difference, no matter how deeply nested.

What does "ignore array order" do?

When enabled, arrays are sorted before comparison so [1,2,3] and [3,1,2] are treated as identical. Disable it to detect reordering as a change.

JSON Compare

Paste two JSON objects and see every difference highlighted — added keys, removed keys, and changed values. Deep comparison including nested objects and arrays.

Runs entirely in your browser — your input is never uploaded, stored, or logged.

Use JSON Compare to spot differences between API responses, config files, or any two JSON values. For formatting, see the JSON Formatter.

How to Use

1Paste your original JSON into the Left panel.
2Paste the modified JSON into the Right panel.
3Click Compare.
4View added (green), removed (red), and changed (amber) keys in the diff.

Common Uses

→Compare two API responses to find what changed between versions
→Diff JSON config files before deploying to production
→Verify that a data transformation produced the expected output
→Check what changed between two database record exports

Examples

Key added

Input

{"name":"Alice","age":29}

Output

+ email: "alice@example.com"
~ age: 29 → 30

Frequently Asked Questions

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