Compare two JSON documents and see the differences highlighted.
Compares two JSON documents key by key and highlights every difference: added keys, removed keys and values that changed. Useful for debugging API responses, comparing config files or reviewing data migrations.
The comparison is structural, not textual — it parses both JSONs into objects and walks the tree recursively. Reordered keys in the same object are not flagged as changes, because JSON objects are unordered by specification.
Both documents must be valid JSON. If either fails to parse, the tool shows the syntax error and its position so you can fix it before comparing. Processing runs locally in your browser — your data is not sent anywhere.
No. Everything runs locally in JavaScript on your device — nothing is transmitted or stored.
Yes. The output is generated locally in your browser and is yours to use however you like — commercially or otherwise.
Once the page loads, yes — all processing happens in JavaScript on your device, with no server calls.
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