How do I run your first node.js script?

### Explore REPL and Console Script 1. Open terminal, type `node` to enter REPL (Read-Eval-Print Loop). Test: ```js console.log('Hello Node.js'); .exit // To quit ``` 2. Create `hello.js`: ```js console.log('Hello from Node.js!'); ``` 3. Run: `node hello.js`. ### Key Concepts Node.js runs JS outside browser using V8 engine. Single-threaded, event-driven.

How do I initialize project and use npm?

### Create Project 1. Make folder: `mkdir my-node-app && cd my-node-app` 2. Init: `npm init -y` (creates package.json). 3. Install package: `npm install lodash` 4. Use in `app.js`: ```js const _ = require('lodash'); console.log(_.capitalize('hello world')); ``` 5. Run: `node app.js` ### Scripts Add to package.json: `"start": "node app.js"`, run `npm start`.

How do I build a simple http server?

### Create Server In project folder, make `server.js`: ```js const http = require('http'); const hostname = '127.0.0.1'; const port = 3000; const server = http.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}/`); }); ``` 1. Run: `node server.js` 2. Visit http://127.0.0.1:3000 in browser. 3. Stop: Ctrl+C.

How do I handle async operations and build cli?

### Async File I/O Create `cli.js`: ```js const fs = require('fs'); fs.readFile('hello.js', 'utf8', (err, data) => { if (err) throw err; console.log(data); }); console.log('This prints first'); ``` Run: `node cli.js` (non-blocking). ### Simple Todo CLI Extend to read/write JSON todos. Use process.argv for args: ```js const fs = require('fs'); const todos = JSON.parse(fs.readFileSync('todos.json', 'utf8')) || []; // Add logic for list/add ``` Practice: Build add/list/delete functions.

Master Node.js Basics: Setup to First Server

Q: How do I install node.js and verify setup?

### Install Node.js 1. Go to [nodejs.org/download](https://nodejs.org/en/download). 2. Download the LTS version (v24.14.0 as of now) for your OS or use Node Version Manager (nvm): ```bash curl -o- https://raw.githubusercontent.com/nvm-sh/nvm/v0.40.4/install.sh | bash source ~/.nvm/nvm.sh nvm install 24 ``` 3. Verify installation: ```bash node -v # Should show v24.x.x npm -v # Should show 11.x.x ``` ### Set Up Editor Install [Visual Studio Code](https://code.visualstudio.com/) (free) and add Node.js extensions like 'Node.js Modules Intellisense'.

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Instant Toolkit

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Step-by-Step Guide

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Install Node.js

Go to nodejs.org/download.

Download the LTS version (v24.14.0 as of now) for your OS or use Node Version Manager (nvm):

curl -o- https://raw.githubusercontent.com/nvm-sh/nvm/v0.40.4/install.sh | bash
source ~/.nvm/nvm.sh
nvm install 24

Verify installation:

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

Set Up Editor

Install Visual Studio Code (free) and add Node.js extensions like 'Node.js Modules Intellisense'.

Why this step matters:

-Establishes a reliable runtime for running JavaScript server-side
-Prevents compatibility issues in real-world projects

30-45 minutes

Node.js installer/nvm, Terminal/Command Prompt, VS Code

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Definition of Done

•node -v and npm -v return correct versions
•REPL starts with 'node' command

Common Mistakes to Avoid

❌ Installing wrong version (not LTS)

→Always choose LTS for stability; use nvm install 24

❌ PATH not updated after install

→Restart terminal or source ~/.nvm/nvm.sh

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Suggested Videos

Learn Node.js - Full Tutorial for Beginners

Node.js and Express.js - Full Course

📚
Learning Resources

📖 Online Courses

Learn Node.js

beginner

Codecademy

Node.js Tutorial

beginner

W3Schools

📖 Recommended Books

Node.js for Beginners

beginner

by Ulises Gascón

🌐 Helpful Websites

Node.js Learn Guides

documentation

Official beginner guides and intros

Node.js API Docs

documentation

Complete reference for modules like http, fs

🛠️ Useful Tools

Node.js

Runtime

JavaScript runtime environment

npm

Package Manager

Package manager for Node.js

VS Code

Editor

Code editor with Node extensions

Master Node.js Basics: Setup to First Server