JavaScript Formatter

美化和压缩JavaScript代码。

输入

输出

Indent:

Beautify & Minify

Format JavaScript with proper indentation.

String Safe

Handles strings, comments, and template literals.

Copy Result

One-click copy to clipboard.

Client-side

All processing in your browser. No data uploaded.

关于JavaScript Formatter

The JavaScript & TypeScript Formatter is a free, browser-based tool that instantly beautifies or minifies your JavaScript and TypeScript code. Whether you received a minified bundle from a third-party library, wrote a quick script without caring about style, or need to reduce file size for production deployment, this formatter handles it all without requiring any installation or account. Beautifying adds consistent indentation to nested blocks, separates statements onto individual lines, and makes logic much easier to read and debug. Minifying strips whitespace, collapses line breaks, and removes comments to produce the smallest possible output — ideal for reducing page load times. The formatter correctly handles single-quoted, double-quoted, and template-literal strings so their contents are never accidentally modified, and it skips over both single-line (//) and block (/* */) comments. All processing happens entirely in your browser, meaning your proprietary code never leaves your machine. Adjust the indentation size between 2 and 4 spaces to match your team's coding style guide.

如何使用JavaScript Formatter

Paste your JavaScript or TypeScript code into the left input panel.
Choose your preferred indentation size (2 or 4 spaces) using the dropdown at the bottom.
Click "Beautify" to format the code with proper indentation and line breaks, or click "Minify" to compress it.
Review the formatted output in the right panel.
Click "Copy" to copy the result to your clipboard and paste it wherever you need it.

常见问题

Does this formatter support TypeScript?

Yes. Because TypeScript is a superset of JavaScript syntax, the formatter handles TypeScript code correctly — including type annotations, generics, and interfaces — using the same parsing logic.

Is my code sent to a server?

No. All formatting and minification runs entirely in your browser using JavaScript. Your code never leaves your device and is not stored anywhere.

Why does the beautified output look slightly different from Prettier?

This tool uses a lightweight, dependency-free formatter focused on indentation and line breaks. For strict style enforcement (semicolons, quotes, trailing commas), use Prettier in your local development environment.

Can I use the minified output in production?

Yes, but for serious production use it is recommended to also run a proper bundler like esbuild or Terser, which perform dead-code elimination and other advanced optimizations on top of whitespace removal.

What is the difference between beautify and minify?

Beautify adds whitespace and indentation to make code human-readable. Minify removes all unnecessary whitespace and comments to make files as small as possible for faster delivery to end users.