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Compare JSON Online

Paste two JSON objects or arrays. See what changed — added, removed, or modified keys.

Your data stays in your browser — nothing is uploaded to any server.

or try sample data

What is JSON Diff?

JSON Diff is a free tool for comparing JSON objects and arrays side by side. It highlights added, removed, and modified keys with color-coded visual diffs. Perfect for API testing, config validation, and debugging.

  • Deep comparison — compares nested objects and arrays at any depth.
  • Path-based highlighting — see exactly which keys changed and where.
  • Privacy-first — all processing happens in your browser. Nothing is uploaded.
  • Accepts any valid JSON — objects, arrays, or mixed structures.