JavaScript Beautifier

Minified JavaScript is written for machines: variable names shortened, whitespace removed, everything on as few lines as possible. That is perfect for delivery and terrible for understanding — and understanding is exactly what you need when debugging a third-party script, reviewing a snippet, or learning from someone else code. This beautifier restores readability: it breaks code at statement boundaries and block braces, indents nested blocks consistently, and puts breathing room around the structure, while respecting strings, template literals, comments and regular expressions so code content is never mistaken for syntax. It is a text-level formatter, not a full parser, so it handles the everyday JavaScript developers actually paste — functions, objects, arrays, control flow — and it says so honestly rather than promising perfection on every exotic construct. The result is code you can read, which is the precondition for code you can fix.

Quick Answer: Paste minified or compressed JavaScript and get readable, indented code back, with strings, comments and regexes respected.

Free Online Tool

Your JavaScript
function greet(name){if(name){return “Hello, “+name;}return “Hello”;}

Beautified JavaScript

How to Use the JavaScript Beautifier

Paste your JavaScript into the input box.
Press Beautify JS and read the formatted code.
Check that blocks, functions and statements are laid out as expected.
Edit the formatted code in your own editor if needed.
Copy the result, or minify it again when it is ready for production.

Key Features

Statement breaks and block indentation restored
Strings, template literals and comments respected
Regular expressions handled so slashes are not mistaken for comments
Consistent two-space indentation throughout
Free, instant and entirely in your browser

Best Practices and Tips

Beautify before debugging minified code: the error line in a stack trace maps to readable code far more easily.
Keep the beautified version for study and the minified version for shipping; never edit minified code directly.
If formatting looks wrong in one spot, check for an unclosed brace or string above it.
For production code, use a proper build tool formatter; this tool is for quick, in-browser readability.
Read beautified third-party code critically: formatting reveals structure, not intent or quality.

Common Mistakes to Avoid

Assuming beautified code is fixed code: formatting reveals bugs, it does not remove them.
Editing minified code directly, which creates errors that are hard to spot in a single line.
Expecting a text formatter to handle every exotic syntax perfectly — full parsers exist for that job.
Pasting code with syntax errors and blaming the formatter for odd output.

Frequently Asked Questions

What does a JavaScript beautifier do?

It reformats JavaScript source for human reading: line breaks after statements and braces, consistent indentation for nested blocks, and spacing that reveals structure. It does not change variable names, logic or behaviour.

Does beautifying change how code runs?

No. JavaScript ignores whitespace and line breaks outside strings, with rare exceptions around automatic semicolon insertion that this formatter avoids by breaking at safe points. Behaviour stays identical.

How is this different from the JavaScript minifier?

They are opposites. The minifier removes whitespace and shortens names for fast delivery; the beautifier restores readable structure for editing and debugging. Use the beautifier while working, the minifier when shipping.

Are strings and regexes safe?

Yes, as far as a text-level formatter can manage: the formatter tracks string, template, comment and regex states so their contents are never treated as code punctuation. Very unusual constructs may still need a full parser.

Is the JavaScript beautifier free?

Yes — free, unlimited and no sign-up required.