How to Use the JavaScript Formatter

1. Copy your JavaScript code, minified or poorly indented.
2. Paste it into the input box above.
3. Choose your preferred indentation: 2 spaces, 4 spaces, or tab.
4. Click "Format Code" to beautify your JavaScript instantly.
5. Review the formatted output in the result box below.
6. Copy the result or click "Download Result" to save it as a file.

Key Features

How It Works

The formatter reads your JavaScript character by character while carefully tracking whether it's inside a string, a template literal, a line comment, or a block comment. This prevents the tool from accidentally breaking apart quoted text or comment content while restructuring your code.

Outside of strings and comments, the tool watches for opening braces {, closing braces }, and semicolons ; to decide where new lines and indentation levels should go. It also tracks parenthesis depth separately, so semicolons inside a for loop's parentheses don't incorrectly trigger a new line.

Each time the nesting depth increases (like entering a function body or an if-block), the indentation for following lines increases by one level. When a closing brace appears, the indentation drops back before the brace itself is printed, giving you clean, properly nested code.

Practical Examples

function calc(a,b){if(a>b){return a-b;}else{return b-a;}}

function calc(a, b) {
  if (a > b) {
    return a - b;
  } else {
    return b - a;
  }
}

function validateUPI(id){if(id.includes('@')){return true;}return false;}

function validateUPI(id) {
  if (id.includes('@')) {
    return true;
  }
  return false;
}

for(let i=0;i<5;i++){console.log('Count: '+i);}

for (let i = 0; i < 5; i++) {
  console.log('Count: ' + i);
}

const user={name:'Amit',greet:function(){console.log('Hi');}};

const user = {
  name: 'Amit',
  greet: function() {
    console.log('Hi');
  }
};

What Is a JavaScript Formatter?

A JavaScript formatter, also called a JS beautifier, is a tool that takes code with inconsistent spacing, missing line breaks, or minified structure and rewrites it into a clean, readable format. It doesn't change what your code does, it only changes how it looks.

Developers rely on formatters constantly, especially when debugging third-party scripts, reviewing pulled code from production, or cleaning up files before a code review. Readable code is easier to scan, easier to spot bugs in, and easier for teammates to understand quickly.

Read our full guide: Why Clean JavaScript Formatting Still Matters for Every Developer

Frequently Asked Questions