JSON Formatter & Validator
Paste your JSON below to beautify, minify or validate it. Syntax errors are pinpointed with the exact line and column, so you can fix them right away. Everything runs locally in your browser — nothing is uploaded anywhere.
Type or paste your JSON above, then click "Format" to see the beautified, highlighted result.
Frequently asked questions
Is my JSON data uploaded to a server?
No. Everything runs locally in your browser via JavaScript; the JSON you paste is never sent anywhere.
What does the "Unexpected token" error mean?
It means the JSON has a syntax error (a trailing comma, an unclosed quote, etc.). The tool shows the exact line and column so you can fix it quickly.
What's the difference between formatting and minifying?
Formatting adds indentation and line breaks so the JSON is easy to read. Minifying does the opposite: it strips all whitespace to shrink the payload, which is ideal for production.