What is the difference between beautification and minification?

Beautification adds clean whitespace and indentation to improve human readability. Minification removes all unnecessary characters, comments, and shortens variable names to reduce file size for faster web loading.

Does the minifier use real AST parsing?

Yes. Minification is powered by Terser, a dedicated JavaScript AST minifier that safely analyzes the syntax tree rather than using risky regex replacements.

Will variable mangling break my global functions?

Terser only mangles local variables and function parameters within closures and scopes, leaving top-level exports and global references intact.

Is my JavaScript code uploaded to any external server?

No. All formatting and AST minification execute purely in your local browser sandbox with zero network transmission.

Dev Tools

JavaScript Formatter & Minifier

Format, beautify or compress JavaScript with AST precision.

100% Private & Client-Side Execution

100% client-side execution. Your source code and intellectual property never leave your machine.

About JavaScript Formatter & Minifier

JavaScript Formatter & Minifier is a dual-engine developer workbench tool for formatting and compressing JavaScript code. In Format mode, it utilizes js-beautify to restore clean indentation, standardized brace placement (1TBS, Allman), and readability. In Minify mode, it runs the dedicated Terser AST engine to safely mangle identifiers, strip comments, eliminate dead code, and compress scripts for production.

How to Use JavaScript Formatter & Minifier

Paste your JavaScript or TypeScript snippet into the editor or click "Load sample".
Choose your mode: "Format & Beautify" for readability, or "Minify & Compress" for production optimization.
In Format mode, configure indentation (2 or 4 spaces) and brace styling (Collapse or Expand).
In Minify mode, toggle variable name mangling and console statement removal.
Click "Copy" or "Download .js" to use your processed script.

Common Real-World Use Cases

Frontend Developers: De-minify and beautify compressed scripts from third-party libraries for debugging.
Node.js Engineers: Standardize code formatting across configuration scripts and serverless functions.
Web Performance Engineers: Minify standalone JavaScript snippets before embedding them into inline script tags.
Security Researchers: Unpack obfuscated or compact JavaScript payloads into readable syntax.

Technical Specifications & Limitations

Supports modern ES6+ JavaScript, modules, async/await, and arrow functions. Operates entirely in browser memory.

Frequently Asked Questions

What is the difference between beautification and minification?: Beautification adds clean whitespace and indentation to improve human readability. Minification removes all unnecessary characters, comments, and shortens variable names to reduce file size for faster web loading.
Does the minifier use real AST parsing?: Yes. Minification is powered by Terser, a dedicated JavaScript AST minifier that safely analyzes the syntax tree rather than using risky regex replacements.
Will variable mangling break my global functions?: Terser only mangles local variables and function parameters within closures and scopes, leaving top-level exports and global references intact.
Is my JavaScript code uploaded to any external server?: No. All formatting and AST minification execute purely in your local browser sandbox with zero network transmission.