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JSON Formatter

Instantly format and pretty-print any JSON, right in your browser.

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Paste your JSON below to instantly format and pretty-print it - entirely in your browser, nothing is sent to our servers.

JustChecker builds tools that respect your data - this one never leaves your browser.

Frequently Asked Questions

No - this tool runs entirely in your browser using JavaScript. Your JSON is never transmitted anywhere.

The tool will show you an error message explaining what's wrong, so you can fix it before formatting.

There's no hard limit enforced by this tool, but very large JSON (several megabytes) may be slow to format depending on your device, since all processing happens in your browser.
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