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

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.

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.

Beautify CSS

Beautify JSON

Beautify HTML

Beautify XML

Beautify SVG

Beautify SQL

Beautify YAML

Beautify TypeScript

Beautify SCSS

Beautify LESS

Beautify Markdown

Beautify GraphQL

Beautify TOML

Explore other tool categories

Minify

Shrink code and assets for production — minify JavaScript, CSS, HTML, JSON and XML before gzip or CDN deploy.

Unminify

Expand minified or compressed code — unminify JavaScript, CSS, TypeScript, SCSS, LESS, SQL, YAML and other formats when debugging or reviewing.

Conversion

Transform data between JSON, YAML, XML and CSV locally — no server uploads.

CSS preprocessors

Compile SCSS or LESS to standard CSS in the browser — pair with beautify or minify for a full stylesheet workflow.

JSON Tools

Validate, format, diff and explore JSON payloads — complementary to minifiers and converters.

SVG Tools

Preview, optimize with SVGO, export Data URI, resize, beautify, convert to JSX and validate SVG — all in your browser.

DevOps & Infra

Terraform HCL format/validate/minify, Dockerfile format & lint, Docker Compose and .env validation.

CI/CD

GitHub Actions and GitLab CI — format YAML and check workflow/job structure in your browser.

Logs & observability

Line-oriented JSON/NDJSON and Nginx/Apache access logs — format, filter, validate, and CSV/TSV.

Kubernetes

Multi-doc manifests, structural validate, Ingress/Deployment starters, and Helm values formatting.

Networking / IP

CIDR, subnets, and IPv4/IPv6 helpers — in your browser.

Security & tokens

JWKS, X.509 certificates, and secrets scan — browser-local.

API & schemas

OpenAPI tools to format, validate, and lint your specs.

Encoding

Encode or decode Base64, URL components and HTML entities — client-side only.

Developer utilities

Timestamps, UUID, ULID, Nanoid, cron, passwords, regex, slugify, number bases, case, text diff, and chmod — all client-side.

Text & Markdown

Count words, build Markdown TOCs, and clean line lists — all in your browser.

AI & LLM

Token counting, pricing estimates, and context-window fit — 100% browser-local.

Serialization

Serialize and deserialize PHP data structures beside JSON workflows.