devcrate / JSON / JSON Formatter & Validator
JSON
Format JSON. Catch errors fast.
Paste messy or minified JSON to pretty-print it with your choice of indentation, or catch syntax errors with a clear message pointing to the problem.
runs entirely in your browser — nothing is uploaded
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How to use the json formatter & validator
- Paste your JSON into the input pane.
- Set your preferred indent width, then click Format.
- If the JSON is invalid, the error message tells you what's wrong.
- Use Minify instead if you need a compact, whitespace-free version.
Frequently asked questions about the JSON Formatter & Validator
Is my data uploaded anywhere when I use the JSON Formatter & Validator?
No. The JSON Formatter & Validator runs entirely in your browser using JavaScript — nothing you type, paste, or select is sent to any server. You can confirm this yourself by opening your browser's network tab while using it.
Is the JSON Formatter & Validator really free, and do I need an account?
Yes — the JSON Formatter & Validator is completely free, with no account, sign-up, or usage limit.
Does it work on mobile and in any browser?
The JSON Formatter & Validator works in any modern browser — Chrome, Firefox, Safari, or Edge — on desktop or mobile, since it's built with standard HTML, CSS, and JavaScript with no special requirements.