A JavaScript formatter takes minified or poorly-indented JavaScript and re-formats it with consistent indentation, proper brace placement, and line breaks after statements. Formatted JS is easier to read, debug, and review in pull requests.

JavaScript Formatting Styles

Allman style — opening brace on its own line (popular in Java/C#)
K&R style — opening brace at end of same line (most popular in JS)
This formatter uses K&R style, the JavaScript community standard
For enforcing a style in projects, use Prettier or ESLint with formatting rules

Frequently Asked Questions

Yes. The formatter handles arrow functions, template literals, destructuring, spread operators, async/await, classes, and modules. It works with any syntactically correct JavaScript.

Prettier has very specific, opinionated rules about line length, trailing commas, and quote style. This formatter focuses on indentation and brace formatting — it's a lightweight beautifier, not a full Prettier equivalent. For production code, use Prettier or your team's lint config.

TypeScript shares most of JavaScript's syntax. Basic TS files will format correctly. However, TypeScript-specific syntax like type annotations and generics may cause formatting edge cases. For TypeScript, use the Prettier VS Code extension.

Done!