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JSON Diff

Compare two JSON objects and highlight every difference.

JSON ToolsBrowser-only • PrivateFree

JSON A

JSON B

Differences

Output will appear here...

Privacy First: All processing happens locally in your browser. Your data never leaves your device and is never uploaded to any server.

About JSON Diff

The JSON Diff tool compares two JSON documents and highlights exactly what changed — which keys were added, which were removed, and which values differ. It's built for reviewing API changes, config drift between environments, and test fixtures where a raw text diff is noisy and hard to read. Both documents are parsed and compared locally in your browser. Sort them first with the JSON Sorter for the cleanest comparison, or format each with the JSON Formatter.

How to Use

1Open JSON Diff and paste or type your data into the input area.
2Adjust any available options to match the result you want.
3Your output is generated instantly — no button-clicking required for most tools.
4Use the Copy or Download button to save your result.

Common Use Cases

Debugging API responses while building web and mobile apps
Cleaning up minified or messy JSON from logs and network tabs
Preparing configuration files and fixtures for testing
Converting data between JSON and other formats for imports/exports

Frequently Asked Questions

How does a JSON diff differ from a plain text diff?

A JSON diff compares the parsed structure, so key order and whitespace don't create false differences. It reports genuine added, removed, and changed values rather than line-by-line text changes.

Should I sort keys before comparing?

Sorting with the JSON Sorter first isn't required, but it makes the comparison and any downstream text diffs cleaner by ensuring both documents use the same key order.

Is JSON Diff free to use?

Yes. JSON Diff is completely free with no sign-up, no subscription, and no usage limits. Every tool on CodeUtilityKit is free forever.

Is my data safe when I use JSON Diff?

Absolutely. JSON Diff runs entirely in your browser. Your input is processed locally with JavaScript and is never sent to, stored on, or logged by any server — so it is safe even for private or sensitive data.