JavaScript Beautifier & Minifier
What is a JavaScript Beautifier?
A JavaScript beautifier is a tool that formats minified or poorly structured JS code into a clean, readable layout with proper indentation, line breaks, and brace placement. A JS minifier compresses code by removing whitespace, comments, and unnecessary characters to reduce file size for production. These tools are essential for debugging minified code and preparing scripts for deployment.
How to Use the JavaScript Formatter
- Paste or type your JavaScript code into the input textarea.
- Choose indent size and whether to remove comments.
- Click Beautify to format with proper indentation, or Minify to compress.
- Use Preview Highlight to see keyword and syntax coloring.
- View line and character counts, then copy or download the result.
Features
- Brace and bracket-aware indentation for functions, blocks, objects, and arrays
- Tracks nesting of curly braces {}, square brackets [], and parentheses ()
- New lines after opening braces and before closing braces
- Configurable indent size: 2 spaces, 4 spaces, or tab character
- Remove single-line (//) and multi-line (/* */) comments
- Preserves string literals (single, double, and template) during formatting
- Basic keyword syntax highlighting: blue for keywords, green for strings, orange for numbers
- Line count and character count statistics
- Minify mode removes comments, extra whitespace, and newlines
- Copy to clipboard and download as .js file
- 100% client-side processing - your code never leaves your browser
Frequently Asked Questions
Is my JavaScript code safe and private?
Yes. All processing happens entirely in your browser using JavaScript. Your code is never transmitted to any external server, ensuring complete privacy.
Does it handle template literals and arrow functions?
The beautifier tracks braces, brackets, and parentheses for indentation. Template literals (backtick strings) are preserved as-is. Arrow functions and modern syntax are handled through the brace-tracking mechanism.
Can I use this for TypeScript or JSX code?
The brace-based formatting works on TypeScript and JSX code as well, since it operates on the same brace/bracket structure. However, advanced TypeScript-specific formatting or JSX indentation rules are not specifically provided.
How does the syntax highlighting work?
The Preview Highlight button renders your code with regex-based coloring: JavaScript keywords like function, const, if, return are shown in blue; string literals in green; numbers in orange; and comments in gray.
Will the beautifier change my code's behavior?
The beautifier only adds whitespace (indentation and line breaks). It does not modify any code logic, so the behavior remains identical. The minifier removes comments and whitespace but also preserves code semantics.