Free Tool

JSON Formatter

Format, validate and minify JSON instantly, free and no signup.

JSON Formatter

Paste minified or messy JSON, get it instantly formatted, validated and ready to copy.

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Frequently Asked Questions

Is my JSON data uploaded anywhere?

No, parsing and formatting happen entirely in your browser using standard JavaScript — nothing is sent to a server.

What happens if my JSON is invalid?

The tool shows a clear error message with the specific parsing issue, using the browser's built-in JSON parser.

Can I use this for large JSON files?

It works well for typical API responses and config files. Very large files (multiple MBs) may be slower since everything runs client-side.

Does it support minifying JSON too?

Yes, use the Minify button to compress your JSON to a single line.