How do I install node.js and verify setup?

# Install Node.js 1. Visit the [official Node.js download page](https://nodejs.org/en/download). 2. Download the LTS version (currently v24.14.0) for your OS: - **Windows**: Download the `.msi` installer and run it. - **macOS**: Download the `.pkg` installer and run it, or use nvm: ```bash curl -o- https://raw.githubusercontent.com/nvm-sh/nvm/v0.40.4/install.sh | bash . "$HOME/.nvm/nvm.sh" nvm install 24 ``` - **Linux (Ubuntu/Debian)**: Use package manager or download tarball. 3. Open a terminal/Command Prompt and verify: ```bash node -v # Should show v24.x.x npm -v # Should show 11.x.x ``` 4. Try the REPL: Run `node` and type `console.log('Hello Node!')`, then `.exit` to quit. 5. Install VS Code for editing: [code.visualstudio.com](https://code.visualstudio.com/).

How do I create your first node.js script with modules?

# First Script 1. Create a project folder: `mkdir my-node-app && cd my-node-app`. 2. Initialize: `npm init -y` (creates package.json). 71 3. Create `hello.js`: ```javascript // CommonJS module console.log('Hello Node.js!'); ``` 4. Run: `node hello.js`. 5. Explore modules: Edit to `const os = require('node:os'); console.log(os.platform());` and run again. 6. Practice in REPL: `node`, then `.help` for commands.

How do I master asynchronous programming basics?

# Async Basics 1. Read [Node.js intro on async](https://nodejs.org/en/learn/getting-started/introduction-to-nodejs). 71 2. Create `async.js`: ```javascript const fs = require('node:fs'); fs.readFile('hello.js', 'utf8', (err, data) => { if (err) throw err; console.log(data); }); console.log('This runs first!'); ``` 3. Run `node async.js` – observe non-blocking order. 4. Experiment with `setTimeout(() => console.log('Async!'), 1000);`. 5. Try Promises: Update to `fs.promises.readFile(...).then(data => console.log(data));`.

How do I build a simple http server?

# HTTP Server Follow official example: 71 1. Create `server.js`: ```javascript const { createServer } = require('node:http'); const hostname = '127.0.0.1'; const port = 3000; const server = createServer((req, res) => { res.statusCode = 200; res.setHeader('Content-Type', 'text/plain'); res.end('Hello World\n'); }); server.listen(port, hostname, () => { console.log(`Server at http://${hostname}:${port}/`); }); ``` 2. Run `node server.js`. 3. Test in browser: http://127.0.0.1:3000/ or `curl localhost:3000`. 4. Enhance: Add `if (req.url === '/about') res.end('About page');` else 404.

How do I use npm packages and build a mini cli app?

# npm and CLI App 1. Install a package: `npm install readline-sync`. 2. Create `cli-app.js`: ```javascript const readlineSync = require('readline-sync'); const name = readlineSync.question('What is your name? '); console.log(`Hello ${name}! Node.js rocks.`); ``` 3. Run `node cli-app.js`. 4. Explore more: Read [fs docs](https://nodejs.org/api/fs.html), build file logger. 43 5. Run `npm ls` to see dependencies.

Master Node.js: From Setup to Building Servers in 5 Steps

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Step-by-Step Guide

1

Install Node.js

Visit the official Node.js download page.
Download the LTS version (currently v24.14.0) for your OS:
- Windows: Download the .msi installer and run it.
- macOS: Download the .pkg installer and run it, or use nvm:
```
curl -o- https://raw.githubusercontent.com/nvm-sh/nvm/v0.40.4/install.sh | bash
. "$HOME/.nvm/nvm.sh"
nvm install 24
```
- Linux (Ubuntu/Debian): Use package manager or download tarball.

Open a terminal/Command Prompt and verify:

node -v  # Should show v24.x.x
npm -v   # Should show 11.x.x

Try the REPL: Run node and type console.log('Hello Node!'), then .exit to quit.
Install VS Code for editing: code.visualstudio.com.

Why this step matters:

-Establishes a reliable runtime environment for server-side JavaScript
-Enables immediate hands-on experimentation with Node.js features

30-60 minutes

Node.js installer from nodejs.org, Terminal/Command Prompt, VS Code editor

$0

Definition of Done

•node -v outputs current LTS version
•npm -v works without errors
•REPL runs and executes basic console.log

Common Mistakes to Avoid

❌ Node not found after install due to PATH issue

→Restart terminal or computer, ensure installer added to PATH

❌ Installing wrong version (not LTS)

→Always select LTS for stability in learning

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Learning Resources

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📖 Recommended Books

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🌐 Helpful Websites

Node.js Official Guides

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Official beginner introduction and getting started tutorials

Node.js API Documentation

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Complete reference for modules like http, fs

🛠️ Useful Tools

Node.js

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JavaScript runtime environment

npm

Package Manager

Package manager for Node.js

Visual Studio Code

Editor

Code editor with Node.js extensions

Master Node.js: From Setup to Building Servers in 5 Steps