How do I install prerequisites and create a project?

# Step 1: Set Up Your Environment ESLint requires Node.js. Download and install the LTS version (v20.19.0+, v22.13.0+, or v24+) from [nodejs.org](https://nodejs.org). Verify installation: ```bash node --version npm --version ``` Create a new project: ```bash mkdir eslint-learn cd eslint-learn npm init -y ``` This generates a `package.json` file.

How do I install and initialize eslint?

# Step 2: Install ESLint Run the official init command: ```bash npm init @eslint/config@latest ``` Follow the prompts: - Choose 'To check syntax, find problems, and enforce code style' - Select JavaScript modules (import/export) - Browser environment - Use config: 'Use a popular style guide' - Airbnb? Or standard - Install dependencies: Yes This installs ESLint v10+ and creates `eslint.config.js`.

How do I explore and customize configuration?

# Step 3: Configure Rules and Options Open `eslint.config.js`. Default looks like: ```javascript import globals from "globals"; import js from "@eslint/js"; export default [ {files: ["**/*.js"], languageOptions: {globals: globals.browser}}, js.configs.recommended, ]; ``` Customize rules: ```javascript { rules: { "no-unused-vars": "warn", "eqeqeq": "error" } } ``` Severities: "off", "warn", "error". 51 50

How do I lint code and apply fixes?

# Step 4: Test ESLint on Sample Code Create `test.js`: ```javascript console.log('Hello'); // Missing semicolon? var x = 1; console.log(x + '2'); // Unused? Loose eq? function unused() {} ``` Run: ```bash npx eslint test.js npx eslint test.js --fix ``` Review output, fix manually if needed. Categories: Possible Problems, Suggestions. 49

How do I integrate into editor and workflow?

# Step 5: Editor Integration and Scripts **VS Code:** Install [ESLint extension](https://marketplace.visualstudio.com/items?itemName=dbaeumer.vscode-eslint). 14 Add to `package.json` scripts: ```json "scripts": { "lint": "eslint .", "lint:fix": "eslint . --fix" } ``` Run `npm run lint`. For CI, add to GitHub Actions or pre-commit hooks.

Master ESLint for Clean JavaScript Code in 5 Steps

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Step-by-Step Guide

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Step 1: Set Up Your Environment

ESLint requires Node.js. Download and install the LTS version (v20.19.0+, v22.13.0+, or v24+) from nodejs.org.

Verify installation:

node --version
npm --version

Create a new project:

mkdir eslint-learn
cd eslint-learn
npm init -y

This generates a package.json file.

Why this step matters:

-Establishes a reliable JavaScript development environment
-Prepares you for real-world project setups using standard tools

30-60 minutes

Node.js, npm, Code editor (VS Code)

$0

Definition of Done

•Node.js and npm are installed and verified
•A project directory with package.json exists

Common Mistakes to Avoid

❌ Installing unsupported Node.js version

→Use Node.js ^20.19.0, ^22.13.0, or >=24 with SSL support

❌ Skipping package.json creation

→Run `npm init -y` first

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Learning Resources

📖 Online Courses

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Pluralsight

ESLint Complete Course Tutorial Guide

beginner

YouTube

ESLint: Creating an Open Source JavaScript Library

intermediate

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Frontend Masters

📖 Recommended Books

ESLint Configuration and Best Practices

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🌐 Helpful Websites

ESLint Official Documentation

documentation

Complete guides on usage, configuration, and rules

ESLint GitHub Repository

repository

Source code, issues, and latest releases

ESLint Rules Reference

documentation

All available rules categorized by type

🛠️ Useful Tools

ESLint

Linter

Core JavaScript linter

VS Code ESLint Extension

Editor Integration

Real-time linting in Visual Studio Code

Master ESLint for Clean JavaScript Code in 5 Steps