JavaScript Formatter – Beautify & Format JS Code Online Free

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Format and beautify JavaScript code instantly with Prettier. Customise indentation, quote style, semicolons, and trailing commas. 100% browser-based — no uploads needed.

JavaScript Formatter

Beautify and format JavaScript code with Prettier

Indentation

Quotes

Trailing comma

Semicolons

JavaScript input

Ctrl + Enter to re-format

Output

Formatted JavaScript will appear here

Paste code above to begin

What is JavaScript Formatter?

A free online JavaScript formatter powered by Prettier. Paste minified or messy JS code and get clean, readable output in one click. Supports ES2022+, JSX, and all modern JS syntax. Customise tab width, quote style (double/single), semicolons, and trailing commas. All formatting runs entirely in your browser — nothing is ever sent to a server.

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JavaScript Formatter Features

Powered by Prettier

Industry-standard formatter used by millions of developers worldwide.

Fully Customisable

Set indentation, quote style, semicolons, and trailing commas to match your style guide.

Live Formatting

Output updates automatically as you type — no button press needed.

100% Private

All formatting runs in your browser. Your code never leaves your device.

JavaScript Formatter FAQ

No — only whitespace, indentation, and style are adjusted. Variable names, function logic, and values are never modified.

The formatter uses Prettier's Babel parser which supports all modern JavaScript including ES2022+, JSX, and class fields.

Yes — paste any minified JS and the formatter will expand it into clean, readable, properly indented code.

No. Prettier runs entirely in your browser as a WebAssembly module. Nothing is uploaded or stored.