JSON Formatter & Validator

Format, validate, and minify JSON instantly. Runs entirely in your browser — your data never leaves your device.

Indent

Sort keys

Input

Invalid JSON

⌘↵ format · Esc exit fullscreen

1 Paste your JSON into the input panel on the left.
2 Pick indent size (2, 4, or tab) and toggle Sort keys if needed.
3 View the formatted, minified, or tree output on the right. Copy or download with one click.

Is this JSON formatter really free?

Yes — completely free. No signup, no ads, no rate limits. The formatter runs in your browser so your data never reaches our servers.

How large a JSON file can it handle?

Up to ~10 MB efficiently. For very large payloads, paste in chunks or use a streaming parser.

Does it validate JSON syntax?

Yes — real-time validation. When parsing fails, the error includes a line and column so you can jump straight to the problem.

Can I sort object keys alphabetically?

Yes. Toggle "Sort keys" in the settings bar. The sort is recursive — nested objects are sorted too.

What about minification?

Switch the output to Minified to strip all whitespace. Useful for reducing payload size before transport.

Can I resize the input and output panels?

Yes — drag the divider between the panels on desktop. Double-click the divider to reset to a 50/50 split. Each panel also has a fullscreen toggle.

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