JSON Formatter & Validator
Pretty-print or minify JSON and pinpoint syntax errors.
How to use the JSON Formatter & Validator tool
- Enter your json in the fields above.
- Adjust any slider or type an exact number — the answer updates as you go.
- Copy the result and close the tab. Nothing you entered was sent anywhere.
About the JSON Formatter & Validator tool
Paste JSON to validate it: valid input returns pretty-printed or minified output; invalid input returns the parser’s exact error message with position.
2-space indentation is the common default. Sorting keys is optional and useful for comparing two JSON blobs that differ only in key order.
Everything runs locally in your browser: no data is uploaded, no account is needed, and it works offline once the page has loaded.
Embed this tool
Customize and copy an iframe. Linking back helps both sites.