JavaScript Beautifier

Beautify, format, and minify JavaScript code. Instantly prettify your scripts with proper indentation and clean structure.

How It Works

This tool parses your JavaScript input using a custom tokenizer and reformats it with proper indentation. All processing happens entirely in your browser — no data is sent to any server.

• Beautify — parses the JavaScript and re-indents it with consistent spacing (2 spaces, 4 spaces, or tabs)
• Minify — removes all unnecessary whitespace and comments to produce the smallest possible output
• Syntax Highlighting — the output uses color-coded highlighting for keywords, strings, numbers, comments, and functions

About JavaScript

JavaScript is a high-level, interpreted programming language that is one of the core technologies of the World Wide Web. It enables interactive web pages, runs on virtually every browser, and can be used for server-side development with Node.js.

Formatting Rules

• Each statement is placed on its own line
• Opening braces appear on the same line as the control structure
• Code inside blocks is indented one level deeper
• Closing braces are placed on their own line at the original indent level
• A space is added after keywords (if, for, while, etc.)
• Spaces are added around operators (=, ===, +, etc.)
• Semicolons are preserved at the end of statements

Common Use Cases

• Debugging — read minified JavaScript from production builds or third-party libraries
• Code Review — standardize indentation and formatting before reviewing changes
• Learning — understand the structure of complex scripts with nested logic
• Optimization — minify JavaScript to reduce file size for production deployment