ToolMano
JSON formatter & validator
Beautify, minify and validate JSON with error positions.
No uploadNo signupWorks offline
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About json formatter & validator
JSON formatter indents messy JSON so it is readable, minifies it back down for shipping, and tells you exactly where a syntax error is when parsing fails.
API responses regularly contain tokens, emails and customer records. Because this formatter parses in your browser instead of posting to a backend, you can paste a production payload without leaking it.
How to use JSON formatter & validator
- 1Paste your JSON into the editor.
- 2Choose Format to indent it or Minify to compress it.
- 3Copy the result, or read the error message if the JSON is invalid.
What it does
- Precise error messages with position
- 2-space, 4-space or tab indentation
- Minify to the smallest valid output
- Payload never leaves the browser
Frequently asked questions
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