JSON Formatter & Validator — Free Online
Beautify and validate JSON with this free online JSON formatter. Paste messy or minified JSON to get clean, indented output — and clear errors if it’s invalid. Runs entirely in your browser.
How to use JSON Formatter
- Paste your JSON into the box.
- Click “Format” to beautify or “Minify” to compact it.
- Copy the result — errors are shown if the JSON is invalid.
Why use this free JSON Formatter tool?
- 100% free — no sign-up, no watermark and no hidden limits.
- Completely private — your files are processed in your browser and never uploaded, so even confidential documents stay on your device.
- Instant & offline-capable — there’s no waiting for uploads or servers; it works even with a weak connection.
- Works on any device — runs in any modern browser on desktop, tablet or mobile.
Frequently Asked Questions
Does it validate my JSON?
Yes — if your JSON is invalid, you’ll get a clear error message pointing to the problem.
Can it minify JSON too?
Yes, use the Minify option to strip whitespace and produce compact JSON.
Is my JSON sent to a server?
No, all formatting and validation happens locally in your browser.