LarzJSON · Free

JSON formatter & validator

Beautify, minify and validate JSON — instantly, in your browser.

Format, validate and beautify JSON instantly — free online tool.

Paste messy JSON and get it beautified and validated in one click, with clear error messages when something's off. Runs entirely in your browser.

How to use the JSON Formatter

Paste your JSONDrop in the raw JSON.

Format or validateBeautify it or check for errors.

Copy the resultGrab the clean output.

Frequently asked questions

Is my data uploaded?

No — formatting happens locally in your browser.

Does it validate JSON?

Yes, with clear error locations.

Is it free?

Yes, completely free.

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