JavaScript Beautifier
Format and beautify minified JavaScript code to make it readable and easy to understand
About JavaScript Beautifier
Overview
The JavaScript Beautifier is a powerful tool that formats and beautifies minified or poorly formatted JavaScript code, making it readable and easy to understand. It restores proper indentation, adds spacing, and organizes code structure while preserving functionality. The tool uses js-beautify, a widely trusted library used by developers worldwide for code formatting.
Features
- Advanced JavaScript beautification using js-beautify library
- Customizable indentation (spaces or tabs) with adjustable size
- Multiple brace style options (K&R, Allman, End Expand)
- Control over newline preservation and maximum empty lines
- Option to break chained method calls for better readability
- Configurable line wrapping for long code lines
- Preserve or format array indentation
- Real-time line count comparison
- Support for modern ES6+ JavaScript syntax
- File upload support (up to 100MB)
- Drag and drop file interface
- One-click copy to clipboard
- Download beautified code directly
- Completely browser-based - your code never leaves your device
- Dark mode support and responsive design
- Fullscreen editing mode for better focus
How to Use
- Paste your minified or unformatted JavaScript code in the input area or upload a .js file
- Configure formatting options according to your code style preferences
- Click "BEAUTIFY JAVASCRIPT" to format your code
- Review the formatted code with proper indentation and spacing
- Copy the beautified code or download it as a .js file
FAQ
Will beautifying my code change its functionality?
No, beautification only adds whitespace, newlines, and formatting without changing code logic. The beautified code executes identically to the original. However, if the original code has syntax errors, those will remain. Beautification is purely cosmetic and does not modify variable names or code structure.
Can I beautify obfuscated code?
You can beautify obfuscated code to improve its formatting, but variable and function names will remain obfuscated. Beautification adds indentation and spacing but cannot reverse variable renaming or string encryption. For truly obfuscated code, you would need a deobfuscator, which is often impossible without the original source.
What indent size should I use?
The most common indent sizes are 2 spaces and 4 spaces. JavaScript community typically uses 2 spaces as recommended by popular style guides like Airbnb and Google. Choose 4 spaces if you prefer more visual separation. Tabs are less common in JavaScript. The key is consistency across your project.
How does this differ from Prettier or ESLint?
This tool focuses on one-time beautification of already-written code. Prettier and ESLint are development tools that format and lint code during development. This beautifier is ideal for quickly formatting minified code, legacy code, or code from external sources. It does not require configuration files or integration with your development environment.