JSON Formatter — Free Online Tool
Format, validate, and minify JSON data with syntax error detection. Essential tool for developers.
Use JSON Formatter
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Use JSON FormatterQuick Facts
- 100% free — no signups
- Client-side processing
- No file size limits
- Works on all devices
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What is JSON Formatting?
JSON formatting (or pretty-printing) adds indentation and line breaks to compact JSON data, making it human-readable. JSON minification does the opposite — removes whitespace to reduce file size.
Why Format JSON?
Raw API responses often come as minified JSON strings. Formatting makes them readable for debugging. Minification reduces payload size for production APIs.
Common JSON Issues
- Missing commas — most common syntax error
- Trailing commas — invalid in strict JSON
- Unquoted keys — JSON requires double-quoted keys
- Single quotes — JSON requires double quotes
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