JSON Formatter & Validator
Paste JSON to pretty-print it, minify it, sort its keys or find exactly where it is invalid. Your data never leaves your browser.
Runs in your browser. Your files never leave your device.
Everything stays in your browser. Your data is never sent anywhere.
How it works
- 01Paste your JSON.
- 02Press Format, Minify, Sort or Validate.
- 03Copy the result.
Tips and common mistakes
Most JSON errors are small
Common problems are a trailing comma after the last item, single quotes instead of double quotes, and keys that are not wrapped in double quotes. JSON is stricter than JavaScript, so fix these first if validation fails.
Format for reading, minify for sending
Indented JSON is easier to read and review. A minified copy with no extra spaces is smaller to send or store.
Questions
Is my data sent anywhere?
No. Everything runs in your browser.
Is my file uploaded to a server?
No. Everything happens inside your browser on your own device. Your files are never sent to us or anyone else.
Is it free?
Yes. It is free to use, with no signup, no watermark and no daily limit.