JSON formatter & validator
Beautify, minify and validate JSON with clear error messages that point to the exact line.
- Files never leave your device
- Instant, no waiting queue
- No watermark, no limits
How to use the JSON Formatter tool
- 1
Paste JSON.
- 2
Click Format, Minify or Validate.
- 3
Copy or download the result.
Format, validate and minify JSON online
Paste JSON to beautify it with proper indentation, minify it for production, or validate it with clear error messages that point to the exact line and column. Perfect for debugging API responses, config files and webhooks.
Common JSON errors
- Trailing commas after the last item.
- Single quotes instead of double quotes.
- Unquoted property names.
- Comments, which standard JSON does not allow.
Convert spreadsheets to JSON with Excel ⇄ CSV / JSON and generate structured data with the schema generator.
Frequently asked questions
Is this tool free?
Yes, it is 100% free with no sign-up, no watermark and no daily limit.
Are my files uploaded to your server?
No. The tool runs entirely in your browser using JavaScript. Your files never leave your device, so the tool is private and works even on slow connections.
How do I validate JSON?
Paste your JSON and click format or validate. Errors are shown with the line and position.
What is the difference between beautify and minify?
Beautify adds indentation for readability; minify removes whitespace to make the file smaller.
Is my JSON sent to a server?
No, it is processed entirely in your browser.
Can it handle large JSON files?
Yes, within your browser's memory limits.