JavaScript Formatter & Minifier

What is JavaScript Formatting?

Key Features

Examples

function add(a,b){return a+b}const doubled=[1,2,3].map(x=>x*2);console.log(doubled)

async function load(id){const r=await fetch(`/api/${id}`);if(!r.ok)throw new Error('bad');return r.json()}

const cfg={retries:3,timeout:5000,headers:{'Content-Type':'application/json'},onError(e){console.warn(e)}}

class Counter{#n=0;inc(){this.#n++}get value(){return this.#n}}

Common Use Cases

Read minified code

Beautify a minified or obfuscated script so you can understand and debug it.

Code review

Format JavaScript before a pull request for consistent, diffable code.

Ship smaller bundles

Minify production JavaScript with Terser to cut bytes and speed up load.

Tidy a snippet

Reformat a quick paste from the console or a gist into clean, readable code.

Technical Details

Beautified with js-beautify

Uses the proven js-beautify engine for predictable, configurable indentation and spacing.

Minified with Terser

Terser is the de-facto JavaScript minifier — it renames locals, drops dead code and strips comments while preserving behavior.

Browser-based

Runs entirely client-side; your code never leaves your device or hits a server.

Best Practices

Format source, minify for production

Keep readable code in your repo and let your build minify with Terser.

Minify modern syntax with care

Terser targets standard JavaScript; very new proposals may need a transpile step first.

Don't hand-edit minified output

Renamed variables make minified code hard to maintain — edit the source, then re-minify.

Frequently Asked Questions