xo

Lint JavaScript

$ xo

$ xo [file.js]

$ xo --fix

$ xo --space

$ xo --print-config

xo [--fix] [--space] [options] [files]

xo is an opinionated JavaScript and TypeScript linter built on top of ESLint. It provides a zero-configuration linting experience with a curated set of strict rules designed to enforce consistent, high-quality code without requiring manual ESLint setup.
The tool includes built-in TypeScript support and optional Prettier integration for combined linting and formatting. The --fix option automatically corrects fixable issues, while --space switches from the default tab indentation to spaces. By defaulting to strict, well-chosen rules, xo eliminates the need for teams to debate and configure linting rules individually.

--fix

Auto-fix issues.

Use space indent.

Require semicolons.

Use Prettier.

Show config.

Opinionated rules. Node.js required. ESLint-based.

xo was created by Sindre Sorhus as an opinionated ESLint wrapper with sensible defaults.

eslint(1), standard(1), prettier(1)