How do I format and beautify JSON?
Paste your messy or minified JSON into the editor. Click 'Format' and it instantly adds proper indentation, line breaks, and spacing. Your JSON becomes readable with collapsible tree view and syntax highlighting.
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Format JSON online for free. Beautify, validate, minify, and pretty-print JSON data instantly. No signup, no upload: runs in your browser. Fix JSON errors and convert to readable format.
Common Questions
Frequently Asked Questions
Everything you need to know about using our JSON Formatter
JSON Formatter - Frequently Asked Questions
Can it validate my JSON for errors?
Yes! The tool automatically validates syntax and highlights errors with line numbers. It catches missing commas, unclosed brackets, invalid escape characters, and type mismatches. Fix errors before using your JSON in production.
Can I convert between minified and pretty JSON?
Absolutely. Use 'Minify' to compress JSON into a single line (great for APIs and reducing file size). Use 'Format' to expand with 2-space or 4-space indentation. Toggle between views instantly.
Does it support large JSON files?
Files up to 5MB are supported (approximately 500,000 lines). The formatter uses efficient streaming for large files. For extremely large files, it provides partial formatting to maintain performance.
Can I edit JSON directly in the formatter?
Yes! The editor allows direct editing with autocomplete for brackets and quotes. Changes are validated in real-time. You can also load JSON from a URL or upload a .json file directly.
About This Tool
What It Does
Format, beautify, and validate JSON data online for free with our professional JSON formatter. Transform minified API responses into readable, indented code with collapsible tree view. Validate syntax, fix missing commas, and identify unclosed brackets instantly. Perfect for API developers, frontend engineers, and data analysts working with REST APIs, configuration files, and NoSQL exports.
Technology
How It Works
Paste messy or minified JSON into the editor. Click 'Format' to add proper indentation, line breaks, and spacing. The validator automatically checks syntax and highlights errors with line numbers. Use 'Minify' to compress JSON for production APIs. Toggle between tree view and raw text. Copy formatted output or download as .json file. Works with files up to 5MB.
Popular Uses
Common Use Cases
1
API debugging - format server responses for readable logging and troubleshooting
2
Config management - pretty-print Kubernetes, Docker, and app config JSON files
3
Data analysis - explore nested JSON datasets with collapsible tree navigation
4
Frontend development - format mock data for React, Vue, and Angular applications
5
Documentation - generate readable JSON examples for API documentation and tutorials
Compatibility
Supported Formats
JSONJSON5JSON Lines
Comparison
How We Compare
| Feature | Keynou | JSONLint | JSON Formatter Pro |
|---|---|---|---|
| Price | Free | Free (ads) | $5/month |
| Syntax Validation | Yes | Yes | Yes |
| Tree View | Yes | No | Yes |
| Minify Option | Yes | No | Yes |
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