How do I format JSON?

Paste your JSON into the input box and it will be formatted instantly. Adjust the indent size (2 or 4 spaces) with the toggle.

What happens if my JSON is invalid?

The tool shows the exact error message and position so you can quickly find and fix the problem.

Yes. Click the Minify button to collapse your JSON into a single line, removing all whitespace.

Is my data sent to a server?

No. All processing happens in your browser. Your JSON never leaves your device.

Why use a JSON formatter instead of console.log?

Console output is single-line and lacks indentation. A formatter shows nested structure clearly, validates syntax in real time, and works for JSON pasted from API responses, log files, or config you can't easily run code against.

When should I minify JSON?

For production API payloads, embedded HTML attributes, URL query parameters, and any context where bytes matter. Pretty-print is for debugging and reading; minified is for shipping.

JSON Formatter

Developer Tools· 30 tools

Free online JSON formatter and validator. Paste any JSON to instantly format it with proper indentation, validate syntax, and minify it back to a single line. Errors are shown inline. No signup required.

Input JSON

Formatted Output

Frequently Asked Questions

References

JSON specification (ECMA-404) — Ecma International

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Frequently Asked Questions

References and sources

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