JSON Compare & Diff
Compare two JSON documents side by side with visual diff, tree view, format, minify & validate.
Privacy first — your input is processed in real time and never stored on our servers. No sign-up required — open any tool and start working immediately.
Compare JSON online — side by side diff
JsonDiff Studio is a free online JSON compare and JSON diff tool built for developers, QA engineers, and API teams. Paste or upload two JSON documents, validate syntax instantly, format or minify with one click, and highlight differences in an easy-to-read tree view.
Key features
- Side-by-side JSON compare — left and right panels with sync, copy & transform
- Visual diff — missing keys (red), new keys (green), changed values (orange)
- JSON validator — live syntax checking as you type
- Format & minify — beautify or compact JSON instantly
- Tree, text & table views — explore structure your way
- Large JSON support — handles big API responses and config files
- No signup — 100% free, runs in your browser
How to use
- Paste JSON into the Left and Right panels (or upload
.jsonfiles). - Use Format to beautify and Validate to check syntax.
- Switch to Tree view and enable Show Differences to compare.
- Review highlighted changes and export with Save or Copy.
Frequently asked questions
How do I compare two JSON files online?
Paste JSON into both panels and toggle Show Differences. The tool highlights added, removed, and changed fields automatically.
Is this JSON diff tool free?
Yes. JsonDiff Studio is completely free with no account required. Built by nkcode.dev.
Does it work with large JSON?
Yes. The tool is optimized for large JSON files with debounced validation and progress feedback during compare operations.
Can I format and validate JSON?
Yes. Use Format to prettify JSON, Minify to compact it, and validation runs automatically as you edit.
Ready to compare JSON files?
Launch JsonDiff Studio