JSON Formatter & Validator — Beautify, Minify and Fix JSON
Free JSON formatter and validator. Beautify, minify and validate JSON with clear error messages showing the line and column. Private, runs in your browser.
Runs in your browser — your data is never uploaded.
Paste raw JSON to format it with clean indentation, minify it for production, or validate it. If the JSON is invalid, the tool points to the line and column of the problem so you can fix it quickly. You can sort keys alphabetically, choose 2- or 4-space indentation or tabs, then copy or download the result.
How to use the JSON Formatter & Validator
- Paste your JSON.
- Choose Format, Minify or Validate.
- Fix any highlighted error, then copy or download the output.
JSON Formatter & Validator — frequently asked questions
What makes JSON invalid?
Common causes are trailing commas, single quotes instead of double quotes, unquoted keys and missing brackets.
Is my JSON uploaded?
No. Formatting happens in your browser.
Can it handle large files?
Yes, typical API responses and config files work well; extremely large files depend on your device.
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