JSON Formatter & Validator
Pretty-print, minify and validate JSON instantly. Runs entirely in your browser — your data never leaves your device.
How it works
Frequently Asked Questions
No. Everything is parsed and formatted entirely in your browser — nothing is uploaded or stored.
Yes — it formats large documents quickly because it runs locally with no network round-trip.
Yes. If the JSON is invalid, it shows the parser message with the exact line and column.
Format, beautify, minify and validate JSON online for free. Paste any JSON and pretty-print it with 2-space, 4-space or tab indentation, or compact it to a single line. If the JSON is invalid you get the precise error location. Because everything runs locally in your browser, your data never leaves your device — ideal for API responses, config files and payloads you would rather not paste into a remote server.