JSON Formatter & Validator Online
Format, validate and minify JSON with an interactive tree view. Errors are pinpointed with line and position — everything runs in your browser.
Frequently asked questions
How do I find an error in my JSON?
Paste the JSON and press Validate — the tool shows the exact position and reason of the first syntax error.
Can I minify JSON for production?
Yes, press Minify to remove all whitespace and get the most compact valid JSON.
Is my data sent anywhere?
No, parsing and formatting run locally in your browser — safe for tokens and internal API responses.