JSON Formatter & Validator
Paste messy JSON to format it with indentation, minify it for production, or find out why it is invalid.
Free · No sign-up · Private — runs in your browser
How to use the JSON Formatter
- Paste your JSON.
- Click Format, Minify or Validate.
- Copy the clean output.
Why use this json formatter?
- Clear error messages
- 2-space, 4-space or tab indent
- Data never leaves your browser
Frequently asked questions
How do I validate JSON?
Paste it and click Format. If the JSON is invalid you will see the error message and where parsing failed.
What are common JSON errors?
Trailing commas, single quotes instead of double quotes, and unquoted keys are the most frequent mistakes.
Is it safe to paste API responses?
Yes. Parsing happens locally; nothing is sent to a server.