JavaScript Beautifier
Format JavaScript code for better readability
The JavaScript Beautifier reformats minified or poorly structured JavaScript into clean, readable code with proper indentation and line breaks. It reconstructs the logical structure of the code so you can trace execution flow and understand function relationships. Essential for analyzing third-party libraries, debugging production bundles, or preparing code snippets for documentation.
๐ How to Use
- Enter minified or unformatted JS
- Select indentation size
- Click the Beautify button
- Get readable formatted code
โจ Features
- โUnminify compressed JS
- โAutomatic indentation
- โImproved code readability
- โEasier debugging
- โConfigurable indent size
๐ก Use Cases
- โขFrontend Developer: Expand .min.js files from production to analyze source code and understand implementation details.
- โขSecurity Researcher: Get a first look at the structure of obfuscated or minified scripts before deeper analysis.
- โขQA Engineer: Navigate bundled JavaScript to locate specific functions and understand application behavior.
- โขStudent: Format minified open-source library code to study internal implementations and design patterns.
- โขTechnical Writer: Clean up code examples for technical documentation, blog posts, and tutorials.
๐ฏ Tips
- โธ2-space indentation is the standard for most JS projects. Use it as default unless your team specifies otherwise.
- โธAfter formatting, use Ctrl+F to search for function names and quickly navigate to the section you need.
- โธIf the output looks unexpected, the issue might be Automatic Semicolon Insertion (ASI). Check for missing semicolons in the original code.
- โธFor eval()-wrapped code, extract the string inside eval first, then beautify it separately.
โ FAQ
Q. Can it deobfuscate code?
A. Only basic formatting is possible. Deobfuscation may not be perfect.
Q. Does it support ES6+ syntax?
A. Yes, modern JavaScript syntax is supported.
Q. Can I beautify JSX code?
A. Basic structural formatting works, but JSX-specific syntax may not be handled perfectly. For React projects, consider using Prettier alongside this tool for best results.
Q. Does beautifying change code behavior?
A. No. Only whitespace and line breaks are modified. The code logic remains completely identical, so it's safe to use.
Q. Can I use this for JSON files too?
A. JSON is better handled by a dedicated JSON formatter, which offers additional features like key sorting. While JSON is a subset of JavaScript, the specialized tool provides more relevant functionality.