Developer Tools
JSON Validator & Formatter
Validate, format, and minify JSON data
100% private. Your files and inputs never leave your device — everything runs locally in your browser.
How to Use JSON Validator & Formatter
Validate, format, and minify JSON data. No signup, no uploads, no watermarks.
- 1
Paste your code, JSON, or data into the editor.
- 2
Pick the transformation or validation options.
- 3
Run it and inspect the results in real time.
- 4
Copy the output or download it as a file.
Why choose JSON Validator & Formatter?
- No uploads — your files never leave your device.
- Free forever with no signup, no watermarks, and no limits.
- Works on any device with a modern browser — no installs.
- Fast, private, and built for getting the job done in seconds.
Frequently Asked Questions
How do I validate JSON?▾
Paste your JSON and the tool reports whether it is valid, pointing to the exact line of any error, and can format or minify it.
Is my JSON uploaded?▾
No. Validation runs locally in your browser.
Is the validator free?▾
Yes — free, unlimited, and private.