JSON Diff
Compare two JSON objects and see the differences.
Runs on your machine. Nothing you paste is uploaded.
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What it does
Paste two JSON documents, the original and the modified version, and get a line-by-line diff with added lines in green and removed lines in red. The comparison is structural: both sides are parsed first, so whitespace and formatting differences do not show up as changes.
Keys are sorted before comparing, which means reordering fields in an object does not produce noise, and trailing commas on neighboring lines are ignored. If either side is not valid JSON, you get a clear notice instead of a misleading diff. The diff can be copied as text with + and - markers.
When you would reach for it
- Compare an API response before and after a backend change.
- Spot what changed between two versions of a config file when the keys were reordered.
- Check a fixture or snapshot against the actual output in a failing test.
- Paste a diff with + and - markers into a code review or bug report.
Also found by searching
- json
- diff
- compare
- difference
- merge