JSON Formatter & Validator Online
Format, beautify, validate, and minify JSON instantly. See errors highlighted and copy clean output — processed entirely in your browser.
How to Format and Validate JSON
Paste or type JSON on the left. The tool validates it in real time, shows any syntax errors, and pretty-prints it with proper indentation for easy reading.
You can also minify JSON to a compact single line for storage or API payloads, and copy the result.
- Paste your JSON
- See it validated and formatted automatically
- Copy the pretty or minified output
Debug JSON with Confidence
Invalid JSON is a common source of bugs in APIs and configs. This validator pinpoints errors so you can fix them fast — and because it runs locally, your data never leaves your device.
Frequently Asked Questions
Can this tool fix my JSON errors?
It highlights syntax errors so you can fix them quickly, and formats the output to make mistakes obvious.
Can I minify JSON?
Yes — switch to minify to compress JSON into a compact single line, great for API payloads and storage.
Is my JSON data private?
Yes. Everything is parsed locally in your browser; nothing is sent to a server.