Beautify JavaScript Online — Free JS Beautifier

Beautify JavaScript code instantly with our free online tool. Format JS with consistent indentation and customizable options. All processing happens in your browser.

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JavaScript Beautification

Beautify JavaScript online. Format JS with consistent indentation — instant browser processing, no uploads.

Features

Format and beautify your JavaScript code with customizable indentation (2 or 4 spaces, or tabs).

Beautify

Format and beautify your JavaScript code with customizable indentation (2 or 4 spaces, or tabs).

Package used

Terser

v5.47.1

Terser is a modern JavaScript compressor that optimizes the size and performance of your code.

Basic example

Minified JavaScript

function calculateTotal(e){let t=0;for(let o=0;o<e.length;o++)t+=e[o].price;return t}const products=[{name:"Laptop",price:999},{name:"Mouse",price:25}];console.log("Total:",calculateTotal(products));

Beautified JavaScript

function calculateTotal(e) {
  let t = 0;
  for (let o = 0; o < e.length; o++) t += e[o].price;
  return t;
}
const products = [{
  name: "Laptop",
  price: 999
}, {
  name: "Mouse",
  price: 25
}];
console.log("Total:", calculateTotal(products));

JavaScript optimization guide

Minification options

Beautify Options

Indentation options for Beautify and Unminify (not used by Minify)

Indentation Size

Sets the number of spaces or tabs for indentation during Beautify and Unminify

Original code

function test(){return true;}

With 2 spaces

function test() {
  return true;
}

With 4 spaces

function test() {
    return true;
}

Difference

Beautify and Unminify both use the indentation controls in the toolbar. Minify ignores them.

Indentation Type

Use spaces or tabs for indentation during Beautify and Unminify

Original code

function test(){return true;}

With spaces

function test() {
  return true;
}

With tabs

function test() {
	return true;
}

Difference

Spaces are more standard, tabs may be preferred according to your code conventions.

JavaScript Beautifier vs Unminifier — What's the Difference

Both terms refer to making minified code readable, but with subtle differences. A beautifier applies consistent formatting rules (indentation style, brace placement) to any code. An unminifier specifically targets minified code, restoring structure that was stripped during compression. Our tool handles both — paste your code and click Unminify or Beautify depending on your needs.