Free JSON Compare / Diff Online
Use this free JSON compare tool to diff two JSON documents and see the changes. Fast, private, and works in your browser.
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What is JSON Compare?
JSON Compare normalizes and diffs two JSON documents so you can see exactly what changed. It is useful for comparing API responses, config versions, and snapshots. The comparison runs in your browser.
How to use this tool
- Paste the first JSON on the left.
- Paste the second JSON on the right.
- View the highlighted differences.
Features
- Diff two JSON documents
- Normalizes formatting before comparing
- Highlights added and removed lines
- Validates each side first
- Runs entirely in your browser
This tool runs in your browser. Your files and text are not uploaded to our servers, and we do not store your input.
Frequently asked questions
Does formatting affect the result?+
No. Both sides are normalized (pretty-printed) before comparing, so only real changes show.
Is my data uploaded?+
No. The comparison happens entirely in your browser.
What if a side is invalid JSON?+
You will see an error so you can fix it before comparing.
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