How to Use the Online JavaScript Beautifier

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

Key Features of This JavaScript Code Formatter

How This Online JavaScript Formatter and Beautifier 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 from this javascript code formatter.

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. Our online JavaScript beautifier is engineered to be one of the best JSBeautifier options for developers who want to format JavaScript quickly without installing extensions.

Developers rely on a good js formatter constantly, especially when debugging third-party scripts, reviewing pulled code from production, or cleaning up files before a code review. Readable code produced by a solid javascript code formatter 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