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How to Beautify JavaScript - Step by Step Guide

Step 1

Input Your JavaScript Code

Let's get your JavaScript code into the beautifier! You have several convenient options:

•
Paste directly: Copy your minified or messy JavaScript code and paste it into the input editor
•
Upload a file: Click "Upload" to select a .js or .txt file from your computer
•
Try the sample: Click "Sample" to load example code and see how the beautifier works

Example: Minified JavaScript Input

Here's what minified, hard-to-read JavaScript looks like:

function calculateTotal(items){let total=0;for(let i=0;i<items.length;i++){total+=items[i].price*items[i].quantity;}return total;}const cart={items:[{name:"Laptop",price:999.99,quantity:1},{name:"Mouse",price:29.99,quantity:2}],discount:0.1};console.log(calculateTotal(cart.items));
Step 2

Automatic Formatting & Beautification

The beautifier instantly transforms your code! As soon as you input JavaScript, the formatter automatically:

•
Validates syntax: Checks for basic syntax errors and formatting issues
•
Adds proper indentation: Makes nested functions, loops, and blocks easy to read
•
Syntax highlighting: Color-codes keywords, variables, strings, and comments for better readability

Example: Beautifully Formatted Output

The same code, now properly formatted and readable:

function calculateTotal(items) {
  let total = 0;
  for (let i = 0; i < items.length; i++) {
    total += items[i].price * items[i].quantity;
  }
  return total;
}
Step 3

Choose Format Options

Customize your output based on your needs! The beautifier gives you control over how your JavaScript appears:

•
Beautify format: Default formatted JavaScript with proper indentation (2 spaces)
•
Minify option: Click "Minify" to compress JavaScript for production use
•
Syntax highlighting: Color-coded elements make it easy to spot different code structures
Step 4

Export Your Formatted JavaScript

Get your perfectly formatted JavaScript ready for use! Multiple export options make it easy to integrate into your workflow:

•
Copy to clipboard: One-click copying for quick pasting into your code editor or application
•
Download as file: Save as a .js file for later use or sharing with your team
•
Real-time formatting: See changes instantly as you edit your code

Frequently Asked Questions

How do I beautify minified JavaScript code?

Simply paste your minified JavaScript into the beautifier. The tool automatically adds proper indentation, line breaks, and spacing to make your code readable. It handles complex nested structures and preserves code functionality.

Can I both beautify and minify JavaScript in the same tool?

Yes! Switch between "Beautify" mode for readable formatting and "Minify" mode for compressed code. Perfect for development (beautified) and production (minified) use cases. For dedicated minification, check out our JavaScript Minifier.

Does the beautifier fix JavaScript syntax errors?

The beautifier formats valid JavaScript code but doesn't fix syntax errors. It will attempt to format the code and may show warnings if it encounters issues. Make sure your code is syntactically correct before beautifying.

Can I beautify large JavaScript files?

Absolutely! The beautifier handles large JavaScript files efficiently. For very large files, the tool processes them smoothly while maintaining perfect formatting and syntax highlighting.

Is the beautified JavaScript compatible with all browsers?

Yes! The beautifier only formats your code and doesn't change its functionality. The formatted JavaScript maintains the same browser compatibility as the original code. It works with ES5, ES6, and modern JavaScript syntax.

Is the JavaScript beautifier completely free?

Yes, totally free with no limitations on file size, usage frequency, or features. No registration required, and you can beautify unlimited JavaScript files with full syntax highlighting.