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. Consistent indentation and spacing — 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

Terserv5.51.2

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.

Frequently Asked Questions — Beautify

Everything about beautification

What does the JavaScript beautifier do?

It applies consistent indentation and spacing without changing behavior — ideal before code review or commits.

Beautify vs unminify — which should I use?

Beautify formats source code; unminify restores compressed code — try the JS unminifier. For production, use the JS minifier.

Can I customize indentation?

Yes — pick 2 or 4 spaces or tabs in the Beautify options.

Is my JavaScript uploaded to a server?

No. Beautification runs entirely in your browser — your JavaScript never leaves your device and is not stored by FastMinify.

Beautify

Make code readable with consistent indentation — beautify JavaScript, CSS, TypeScript, SCSS, LESS, Markdown, GraphQL, SQL, YAML and more in your browser.

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