Developer tools
Format JSON
Pretty-print, minify, or validate JSON locally in your browser.
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Why use it
Format and check JSON without uploading it
- 01
Readable or compact output
Pretty-print JSON with consistent indentation or minify it for compact output.
- 02
Useful syntax errors
See validation errors with line and column details when available.
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Supported files and limits
- Input
- JSON text
- Privacy
- Processed locally in your browser
- Output
- Formatted or minified JSON
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How to format JSON
- 1
Enter JSON
Paste or type JSON into the input field.
- 2
Choose an action
Format, minify or validate the JSON, then copy the result.
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Frequently asked questions
Is my JSON sent to a server?
No. Formatting, minifying and validation run locally in your browser.
Can I validate JSON without changing its format?
Yes. Validate checks the syntax and shows valid JSON in a readable format.