JS Minifier Beautifier

What is JS Minifier Beautifier?

JS Minifier Beautifier is a free online tool for minifying and beautifying JavaScript code. It helps you reduce JavaScript file size by removing whitespace and comments, or format JavaScript code with proper indentation for better readability.

Whether you're optimizing JavaScript for production, debugging minified code, or improving code readability, this tool makes it easy to format and compress JavaScript instantly.

How to Use

1. Paste JavaScript Code: Enter or paste your JavaScript code into the input area
2. Choose Action:
   • Beautify: Format JavaScript with proper indentation and newlines
   • Minify: Remove all unnecessary whitespace and comments
3. Select Indentation: Choose 2 spaces, 4 spaces, or 1 tab (for beautify)
4. Copy Result: Use the copy button to copy the formatted JavaScript

Features

• Minify JavaScript to reduce file size
• Beautify minified JavaScript for readability
• Adjustable indentation (2/4 spaces or tabs)
• Remove comments automatically
• Show size reduction percentage
• One-click copy to clipboard
• Swap input/output functionality
• ES6+ support
• Dark mode support
• Mobile-friendly interface

Use Cases

For Minification

• Production Deployment: Reduce JavaScript bundle size for faster loading
• Performance Optimization: Improve page load speed
• Bandwidth Saving: Lower hosting costs and data usage
• Mobile Optimization: Better experience on mobile devices

For Beautification

• Code Review: Make minified code readable for review
• Debugging: Easier to find and fix issues in compressed code
• Learning: Understand code structure from minified libraries
• Code Maintenance: Improve readability for long-term maintenance

Why Minify JavaScript?

Minifying JavaScript offers several benefits:

• Faster Page Load: Smaller files download faster
• Better Performance: Reduced parsing time for browsers
• Lower Bandwidth: Save money on hosting and CDN costs
• Improved SEO: Faster sites rank better in search engines
• Better UX: Users experience faster, more responsive sites

Privacy & Security

Your JavaScript code is processed entirely in your browser. No code is sent to our servers, ensuring complete privacy and security for your sensitive code.

Technical Details

This tool uses custom algorithms to:

• Remove single-line (//) and multi-line (/* */) comments
• Eliminate unnecessary whitespace and line breaks
• Preserve string literals and regular expressions
• Add proper indentation for beautification
• Calculate accurate size reduction statistics

Tips

• For Production: Always minify JavaScript before deployment
• For Development: Use beautified code for easier debugging
• Use Build Tools: For large projects, consider webpack, Rollup, or Terser
• Test Thoroughly: Always test minified code before deploying
• Keep Backups: Maintain readable versions of your code

FAQ

Q: Will minification break my JavaScript code?
A: No, minification only removes whitespace and comments. The functionality remains identical.

Q: Can I beautify already minified code?
A: Yes! Use the Beautify function to make any minified JavaScript readable again.

Q: Does it support ES6+ features?
A: Yes, it handles modern JavaScript including arrow functions, template literals, async/await, and more.

Q: Is there a file size limit?
A: No hard limit, but very large files may slow down your browser.

Q: Should I use this for production?
A: For basic minification, yes. For advanced optimization, consider dedicated build tools like Terser or UglifyJS.

Credits

• js-beautify: Beautifier for javascript.