JavaScript Beautifier & Minifier
Paste your JavaScript code below to instantly beautify it with proper indentation and line breaks, or minify it by stripping whitespace and comments. Everything runs in your browser - your code stays private.
Try These Examples
greet()- A simple greeting function with a conditional returnfetchData()- An async fetch call with error handlingdebounce()- A classic debounce utility function
How It Works
This tool processes your JavaScript entirely in the browser using two lightweight algorithms:
Beautifier
The beautifier scans your code character by character, tracking opening and closing braces, brackets, and parentheses to determine the current nesting depth. After each opening brace or bracket, it inserts a newline and increases indentation. Before each closing brace or bracket, it decreases indentation and starts a new line. Semicolons at the end of statements also trigger a newline. String literals (single-quoted, double-quoted, and template literals) are preserved without modification so their contents are never reformatted.
Minifier
The minifier first strips single-line comments (// …) and multi-line comments (/* … */) while preserving strings. It then collapses consecutive whitespace characters into a single space and removes spaces around operators and punctuation where safe to do so, producing the smallest output that still executes identically.
Frequently Asked Questions
Does this tool send my code to a server?
No. All beautification and minification happens entirely in your browser using JavaScript. Your code never leaves your machine.
Will the beautifier or minifier change my code's behavior?
No. Beautifying only adds or adjusts whitespace and line breaks. Minifying removes unnecessary whitespace, newlines, and comments. Neither operation changes the logic or execution of your code.
Can I use this on production-level code?
This tool uses a lightweight regex-based approach that works well for typical JavaScript. For large production builds, a dedicated build tool like Terser or esbuild is recommended, as they can perform advanced optimizations such as dead-code elimination and variable renaming.
What indent style does the beautifier use?
The beautifier uses 2-space indentation by default. You can switch to 4 spaces or tabs using the indent-size selector above the input.