Node.js Linting & Formatting

Consistent code quality and style is important for Node.js projects, especially in team environments.

This guide covers both JavaScript and TypeScript tooling, as they share similar linting and formatting ecosystems.

ESLint is the most popular JavaScript/TypeScript linting tool that helps identify and report on patterns found in your code. It's highly configurable and supports:

Here's a more complete.eslintrc.json configuration for a Node.js project with TypeScript support:

],

Beyond basic linting, ESLint offers powerful features for maintaining code quality:

Prettier is an opinionated code formatter that enforces a consistent style by parsing your code and re-printing it with its own rules. It supports: JavaScript, TypeScript, JSX, CSS, SCSS, JSON, and more

Use Prettier for formatting and ESLint for catching potential errors and enforcing code patterns.

Prettier can be customized and integrated into your workflow in various ways:

# Format all files npx prettier --write . # Check formatting without making changes npx prettier --check .

To avoid conflicts between ESLint and Prettier, set up proper integration: