JSON Formatter - Format & Beautify JSON Online

Paste your JSON to validate, format, and syntax-highlight it instantly. 100% client-side.

About JSON Formatter

This free online JSON formatter helps developers quickly validate and beautify JSON data. Features include:

Instant validation — Detects syntax errors with clear messages
Syntax highlighting — Color-coded keys, strings, numbers, booleans, and nulls
Flexible indentation — Choose 2 spaces, 4 spaces, or tabs
Minification — Compress JSON to a single line
Privacy-first — All processing happens in your browser

Frequently Asked Questions

How do I format JSON online?

Paste your JSON into the input box, select your preferred indentation (2 spaces, 4 spaces, or tabs), and click Format. The tool instantly validates and beautifies your JSON with syntax highlighting.

Does this JSON formatter validate my data?

Yes. The formatter first validates your JSON using the browser's native JSON parser. If there are syntax errors, it displays the exact error message and position to help you fix the issue.

Can I minify JSON with this tool?

Yes. Click the Minify button to compress your JSON by removing all unnecessary whitespace, producing the most compact representation.

JSON Formatter & Beautifier

About JSON Formatter

Frequently Asked Questions