JSON Diff
Compare two JSON objects and highlight added, removed and changed keys.
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About this tool
When two JSON objects should be the same but behave differently, the first step is finding where they diverge. Manually comparing nested objects is tedious and error-prone. This tool does it automatically: it walks both objects recursively and lists every key that was added, removed, or changed.
Unlike a text diff, a JSON diff is structure-aware. Moving a key from one position to another in the same object is not a change — the values are compared, not the raw lines.
How to use it
- Paste the first JSON object in the left panel ('before') and the second in the right panel ('after').
- Click Compare.
- Added keys are green, removed keys are red, changed keys are yellow. Equal keys are shown dimmed.
- Toggle 'Show unchanged' to hide equal paths and focus on what changed.
Common problems
- The diff shows all keys as changed.
- Check that both inputs are valid JSON. A missing closing brace or a trailing comma will make the whole document parse as a string literal.
Frequently asked questions
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