Free JSON formatter & validator

Paste messy JSON and click Beautify to indent and format it, or Minify to strip whitespace. Invalid JSON shows a clear error message so you can fix it. Everything runs locally in your browser.

Frequently asked questions

Does it validate JSON?

Yes — if your JSON is invalid, it shows the parser error so you can locate the problem.

Is my JSON uploaded anywhere?

No — parsing and formatting happen entirely in your browser.