JSON Diff Checker
Compare two JSON documents side by side. The tool finds every added, removed and changed key with its full path, shows color coded results, and gives you clear stats. Both inputs are checked for valid JSON first.
Input
Waiting for input.
Waiting for input.
Diff result
Keys in A
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Keys in B
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Added
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Removed
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Changed
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Unchanged
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Enter two JSON documents and click "Compare" to see the differences.
Keys in A
Keys in B
How to use
- Paste your first JSON document into "JSON A" and the second into "JSON B".
- Click "Compare". Both inputs are checked for valid JSON, and any error shows the line and column.
- Read the color coded list: green rows are added keys, red rows are removed keys, amber rows are changed keys.
- Turn on "Show side-by-side key lists" to see the full key list of each document next to each other.
- Use "Copy diff as text" to copy a plain text summary of all differences.
Frequently asked questions
What does the JSON Diff Checker do?
It compares two JSON documents and lists every added, removed and changed key with its path, color coded so differences are easy to spot.
How are arrays compared?
Arrays are compared item by item using the index in brackets, for example items[2]. Nested objects use dot notation, for example user.address.city.
Is it free?
Yes, it is free and needs no signup. Everything runs in your browser, so your data never leaves your device.