JS Unminify
Professional JavaScript Beautifier & Formatter
Why Choose Our JS Unminify Tool?
Transform minified JavaScript into readable, well-formatted code with our advanced beautifier. Perfect for developers, debuggers, and code reviewers.
Lightning Fast Processing
Instantly unminify and beautify JavaScript code of any size. No waiting, no loading times - just pure speed powered by optimized algorithms.
100% Client-Side Security
Your code never leaves your browser. All processing happens locally on your device, ensuring complete privacy and security for your sensitive code.
Advanced Formatting Options
Customize indentation, line breaks, spacing, and more. Supports ES6+, JSX, and modern JavaScript syntax with intelligent code formatting.
Syntax Highlighting
Beautiful syntax highlighting powered by Prism.js makes your code easy to read and understand. Supports both light and dark themes.
Multiple Export Options
Download beautified code as a .js file, copy to clipboard with one click, or upload files directly from your device. Flexible workflow support.
Real-Time Statistics
Track file size reduction, line count, and other metrics in real-time. Understand the impact of minification on your codebase instantly.
How to Use JS Unminify Tool
Paste or Upload
Copy your minified JavaScript code and paste it into the input area, or upload a .js file
Customize Settings
Adjust formatting options like indentation, spacing, and line breaks to match your style
Click Unminify
Hit the Unminify button and watch your code transform into readable, formatted JavaScript
Copy or Download
Copy the beautified code to clipboard or download it as a file for your project
What is JavaScript Unminification?
JavaScript unminification, also known as code beautification or prettification, is the process of transforming compressed, minified JavaScript code back into a readable, well-formatted structure. When developers deploy web applications, they often minify JavaScript files to reduce file size and improve loading times. However, this makes the code extremely difficult to read and debug.
Our JS Unminify tool reverses this process by adding proper indentation, line breaks, and spacing, making the code structure clear and understandable. This is essential for debugging third-party libraries, analyzing production code, understanding code flow, and learning from minified examples.
Key Features of Our JavaScript Beautifier
- ✓ES6+ Support: Full compatibility with modern JavaScript syntax including arrow functions, async/await, destructuring, and template literals
- ✓JSX Compatible: Perfect for React developers working with minified JSX code
- ✓Customizable Formatting: Control indentation size, character type (spaces/tabs), line wrapping, and preservation of original formatting
- ✓Dark Mode Support: Eye-friendly dark theme for late-night coding sessions
- ✓No Installation Required: Works directly in your browser - no software to download or install
- ✓Free & Unlimited: Use as much as you want, no registration, no limits
When to Use a JavaScript Unminifier
Debugging Production Issues
When errors occur in production environments with minified code, stack traces become nearly impossible to read. Unminifying the code helps identify the exact location and cause of errors.
Analyzing Third-Party Libraries
Understanding how external libraries work by examining their code structure. Useful for learning advanced techniques or troubleshooting integration issues.
Code Review & Auditing
Security audits and code reviews require readable code. Beautifying minified scripts helps identify potential vulnerabilities or malicious code.
Learning & Education
Students and developers can learn from production code examples by making them readable and studying the implementation patterns.
Frequently Asked Questions
Is this tool completely free to use?
Yes! Our JS Unminify tool is 100% free with no limitations. You can beautify unlimited JavaScript files without any registration or payment required.
Is my code secure when using this tool?
Absolutely. All code processing happens entirely in your browser using client-side JavaScript. Your code never gets uploaded to any server, ensuring complete privacy and security.
Can this tool deobfuscate heavily obfuscated code?
This tool focuses on beautifying and formatting minified code. While it can make obfuscated code more readable by adding proper formatting, it cannot reverse advanced obfuscation techniques like variable name mangling or control flow flattening.
What file size limit does the tool have?
There's no strict file size limit, but performance depends on your browser and device capabilities. The tool handles files up to several megabytes efficiently on modern browsers.
Does it work with TypeScript or other languages?
This tool is optimized for JavaScript (including ES6+ and JSX). While it may work with TypeScript in some cases, results may vary. For best TypeScript support, use a dedicated TypeScript formatter.