JS Beautifier
Format and beautify JavaScript code instantly
Free online JavaScript beautifier to format and indent your JS code. Make minified or messy JavaScript readable and properly formatted. Perfect for developers. All processing happens in your browser - your code stays private.
How to beautify your JavaScript code?
We've all been there - you download a JavaScript library or get code from a colleague, and it's all compressed into one unreadable line. Or maybe you minified your code for production and now need to debug it. Here's how our beautifier helps:
- Copy your JavaScript code - whether it's minified, obfuscated, or just poorly formatted. Paste it into the input box above.
- Watch as the tool instantly reformats your code with proper indentation, consistent spacing, and clear structure. Nested functions, objects, and arrays become easy to follow.
- Review the beautified code to ensure it looks correct, then copy it and use it in your project. Everything happens locally in your browser, so your code never leaves your computer.
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Why beautify JavaScript code?
Reading minified JavaScript is like trying to solve a puzzle blindfolded - technically possible, but unnecessarily difficult. When JavaScript is properly formatted, you can actually see the code structure, understand the logic flow, and spot bugs quickly. Beautification adds proper indentation so you can see which code belongs to which function or block. It organizes your code visually, making it clear where loops start and end, where functions are nested, and how your code is structured. This is especially valuable when debugging, learning from existing code, or working on team projects where code readability matters.
When do you actually need to beautify JavaScript?
- Debugging minified code: Production code is often minified for performance, but when bugs appear, you need readable code to find and fix them quickly.
- Learning from libraries: Want to understand how popular JavaScript libraries work? Beautify their minified code to study their implementation.
- Code reviews: Clean, formatted code makes it easier for team members to review your work and catch potential issues before they become problems.
- Refactoring legacy code: Old codebases often have inconsistent formatting. Beautify them to establish a consistent style before making changes.
- Teaching and learning: If you're learning JavaScript or teaching others, formatted code is essential for understanding concepts and examples.
- Fixing third-party code: Sometimes you need to modify code from npm packages or CDN libraries. Beautifying helps you understand what you're working with.
Frequently Asked Questions (FAQs)
What does JavaScript beautification actually do?
JavaScript beautification takes your code and reformats it with consistent indentation, proper spacing, and logical line breaks. It organizes your functions, objects, arrays, and control structures so they're visually clear and easy to follow. Nested code gets indented properly, making it obvious what belongs where. It's like auto-formatting for JavaScript - your code does the same thing, but now humans can actually read it.
Can I beautify minified or obfuscated JavaScript?
Yes! This is one of the most common use cases. If you have minified JavaScript (like from a production build or a CDN), paste it here and get beautifully formatted, readable code back. While obfuscated code (where variable names are intentionally scrambled) will be formatted, the variable names will still be obfuscated - but at least you'll be able to see the structure and logic flow.
Will beautifying change how my JavaScript works?
No way! Beautification only changes the formatting - things like spaces, tabs, and line breaks. It doesn't modify any of your actual code logic, function names, variables, or values. Your JavaScript will behave exactly the same, it'll just be much easier to read and understand.
Is my JavaScript code secure when using this tool?
Absolutely! All processing happens entirely in your browser using JavaScript. Your code never gets uploaded to any server or sent over the internet. This means your proprietary code, API keys, or sensitive logic stays completely private on your device. Perfect for working with confidential or commercial code.
Can this tool handle complex JavaScript with frameworks?
Yes, the beautifier works with vanilla JavaScript, ES6+, and code from frameworks like React, Vue, Angular, and more. It formats the JavaScript syntax regardless of what framework or library you're using. However, JSX (used in React) might need special handling - this tool focuses on pure JavaScript formatting.