JSON Formatter
Format, validate, or minify JSON
Paste JSON to pretty-print, validate, or minify it — with clear error messages if it's invalid.
Frequently Asked Questions
Is JSON Formatter free to use?+
Yes, completely free with no limits, no sign-up, and no watermarks.
Are my files uploaded to a server?+
No — everything runs locally in your browser using JavaScript. Your files never leave your device.
Is there a file size limit?+
There's no artificial limit we impose. The practical limit depends on your device's memory, since all processing happens locally.
Do I need to create an account?+
No account or sign-up is required. Just open the tool and use it.
Which browsers are supported?+
Any modern browser — Chrome, Firefox, Safari, or Edge — on desktop or mobile.
What happens to my files after I close the tab?+
Nothing is stored. Since your files never leave your device and nothing is uploaded, closing the tab simply clears everything from memory.