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JSON Formatter

Format, beautify, minify and validate JSON online. Clear error messages, runs entirely in your browser.

Formatted output appears here

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What is the json formatter?

Format, beautify, minify and validate JSON in one place. Invalid JSON shows a clear error so you can find the problem quickly.

How to use the JSON Formatter

Paste your JSON into the editor.
Click Format to pretty-print or Minify to compress it.
Fix any error shown, then copy the result.

Common uses

Reading API responses
Validating config files
Shrinking JSON before sending it

Frequently asked questions

What makes JSON invalid?

Common causes are trailing commas, single quotes instead of double quotes, and unquoted keys.

Can I validate JSON without formatting it?

Yes. Any parse error is shown as soon as you run the formatter.

Is my JSON sent to a server?

Everything runs locally in your browser — nothing is uploaded or stored.

Also known as: json validator, json beautifier, pretty print json, json minifier, format json online, json lint, json viewer.

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