JSON Formatter & Validator
Format & validate JSON
A JSON formatter re-indents JSON so it's readable, minifies it to strip whitespace, and validates it — pointing out syntax errors like trailing commas or missing quotes. Paste JSON below; it runs entirely in your browser, nothing uploaded.
Frequently asked questions
What does a JSON formatter do?
It re-indents JSON to be readable or minifies it, and validates the syntax, showing where any error is.
How do I fix invalid JSON?
Check for trailing commas, unquoted keys, single quotes, and unclosed brackets. The error message here helps you locate it.
Is my JSON uploaded?
No — everything runs in your browser.