Everything you need to know about JavaScript beautification.
What is a JavaScript beautifier and why use one? ▼
A JavaScript beautifier reformats compressed, minified, or poorly formatted JS code into properly indented, readable code with consistent spacing. It's essential for debugging production code, understanding third-party libraries, onboarding to new codebases, and maintaining consistent code style across a team.
Is my JavaScript code sent to a server? ▼
No. All processing happens 100% in your browser using JavaScript. Your code never leaves your device and is never sent to any server. This makes it safe to use with proprietary, sensitive, or client code.
Can I upload a .js file directly? ▼
Yes. Click the Upload JS File button and select a .js, .jsx, .ts, or .mjs file. The file contents will load into the input editor automatically. You can then beautify and download the formatted version.
What is the difference between beautify and minify? ▼
Beautify formats code for human readability — adding proper indentation, spaces, and line breaks. Minify does the opposite — it removes all whitespace, comments, and unnecessary characters to make the file as small as possible for production deployment. Both are available in this tool.
What do the code metrics show? ▼
After beautifying, the analysis section shows: number of functions, variables, lines of code, comments, classes, import statements, async functions, and size savings. These metrics help you understand code complexity and maintainability at a glance.
Can I use this to format TypeScript or JSX? ▼
Yes. The beautifier works well for TypeScript (.ts) and JSX (.jsx) files since they share similar syntax with JavaScript. Upload your .ts or .jsx file and the formatting will apply correctly to the code structure.
Should I use this instead of Prettier or ESLint? ▼
For production projects, Prettier or ESLint integrated into your build pipeline is recommended. This online tool is perfect for quick one-off formatting, debugging minified code, working without a local environment, or situations where you can't install Node.js tools.