Free Developer Tool
JavaScript Formatter
Beautify or minify your JavaScript code instantly. Format with custom indentation, remove comments, and optimize for production. 100% client-side processing - your code never leaves your browser.
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Quick Usage Guide
Beautify Mode
Beautify adds proper indentation, line breaks, and spacing to make your code readable. Choose between 2 spaces, 4 spaces, or tabs for indentation.
Minify Mode
Minify removes unnecessary whitespace, line breaks, and optionally comments to reduce file size for production deployment.
JavaScript Formatting Best Practices
Why Format JavaScript?
Consistent formatting improves code readability, makes debugging easier, and helps teams maintain coding standards. Well-formatted code is easier to review and understand.
Why Minify JavaScript?
Minification reduces file size by 30-80%, improving page load times and reducing bandwidth costs. Essential for production websites where every kilobyte matters.
Indentation Standards
Most JavaScript style guides recommend either 2 spaces (Google, Airbnb) or 4 spaces for indentation. Tabs are also popular as they allow customizable display width. Consistency within a project is key.
Important Note
This tool provides basic formatting. For production use, consider build tools like Webpack, Rollup, or esbuild which offer advanced minification including variable renaming, dead code elimination, and tree shaking.
Beautify vs Minify Comparison
| Aspect | Beautified | Minified |
|---|---|---|
| Purpose | Development & debugging | Production deployment |
| Readability | High - easy to read | Low - single line |
| File Size | Larger | 30-80% smaller |
| Comments | Preserved | Removed (optional) |
| Use Case | Code review, learning | Live websites, CDN |
Common Use Cases
Debugging Minified Code
Beautify minified JavaScript from production sites to understand how third-party scripts work or debug issues in compressed code.
Quick Optimization
Minify small scripts or inline JavaScript before adding to HTML without setting up a full build pipeline.
Code Review
Format messy or inconsistently styled code before reviewing to focus on logic rather than formatting issues.
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