JSON Diff — Compare Two JSON Documents
Paste two JSON objects side-by-side and instantly see every addition, deletion, and change highlighted line by line.
What Is a JSON Diff Tool?
A JSON diff tool lets you compare JSON online by showing exactly what changed between two documents. Added lines are highlighted in green, removed lines in red, and unchanged lines are shown for context. Compare JSON online to spot differences in API responses, config file versions, or database snapshots.
Common Use Cases
- Comparing API responses before and after a code change
- Auditing JSON config file changes between deployments
- Debugging n8n, Zapier, or AI workflow output differences
- Reviewing ChatGPT or Claude output changes across prompts
- Tracking what changed in a database export over time
How Our JSON Diff Works
When you compare JSON online with our tool, both documents are first validated and pretty-printed with consistent indentation, so the JSON diff reflects semantic changes — not just formatting differences. The comparison uses the Myers diff algorithm for accurate minimal edit sequences.
If either document has errors, use the JSON Fixer first to produce valid JSON, then compare.
Frequently Asked Questions
Yes, completely free with no signup. Compare unlimited JSON documents.
No. All comparison happens in your browser. Your JSON never leaves your device.
Yes. The tool pretty-prints both inputs first, so nested structures are compared line by line with full indentation context.
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