How do I explore node.js repl and javascript basics?

# Explore the REPL and Core JavaScript 1. Open terminal and start REPL: `node` 2. Test basics: ```javascript console.log('Hello Node.js!'); > Hello Node.js! 1 + 2; > 3 process.version; > 'v24.14.0' .exit # to quit ``` 3. Review async nature: Node.js uses non-blocking I/O. 4. Create `basics.js`: ```javascript console.log('Start'); setTimeout(() => console.log('Async callback'), 0); console.log('End'); // Output: Start, End, Async callback ``` Run: `node basics.js` 5. Read [Introduction to Node.js](https://nodejs.org/en/learn/getting-started/introduction-to-nodejs).

How do I build your first http server?

# Create a Hello World HTTP Server 1. In project folder, create `server.js` with official example: ```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 running at http://${hostname}:${port}/`); }); ``` 2. Run: `node server.js` 3. Open browser to `http://127.0.0.1:3000` – see "Hello World". 4. Stop with Ctrl+C. Enhance: Add `req.url` handling for routes.

How do I master core modules (fs, path, events)?

# Hands-On with Built-in Modules 1. **File System (fs):** Create `readfile.js`: ```javascript const fs = require('node:fs'); fs.readFile('server.js', 'utf8', (err, data) => { if (err) throw err; console.log(data); }); ``` Run: `node readfile.js` 2. **Path:** `const path = require('node:path'); console.log(path.join(__dirname, 'file.txt'));` 3. **Events:** See Node's event-driven model in server callbacks. 4. Reference [API Docs](https://nodejs.org/api/fs.html), [path](https://nodejs.org/api/path.html). 5. Practice: Build a server that serves file contents.

How do I build a simple cli app and next steps?

# Project: Simple CLI Todo App 1. Install learnyounode: `npm install -g learnyounode` (official interactive tutorial). 2. Run `learnyounode` and complete lessons. **Or build manually:** `todo.js` – use process.argv, fs for read/write todos. ```javascript const fs = require('node:fs'); const args = process.argv.slice(2); if (args[0] === 'add') { fs.appendFileSync('todos.txt', args.slice(1).join(' ') + '\n'); } ``` Run: `node todo.js add Buy milk` 3. Next: Explore Express.js, databases. Review full [Learn Node.js](https://nodejs.org/en/learn).

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

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

# Install Node.js and Verify Setup 1. Visit the [official Node.js download page](https://nodejs.org/en/download). 2. Download the LTS version (currently v24.14.0) installer for your OS (Windows, macOS, or Linux). 3. Run the installer and follow the prompts. **For advanced users (recommended):** Use nvm (Node Version Manager): ```bash curl -o- https://raw.githubusercontent.com/nvm-sh/nvm/v0.40.4/install.sh | bash source ~/.bashrc # or restart terminal nvm install 24 nvm use 24 ``` 4. Open a terminal and verify: ```bash node -v # Should output v24.14.0 or similar npm -v # Should output 11.9.0 or similar ``` 5. Install a code editor like [VS Code](https://code.visualstudio.com/). Create a project folder: `mkdir my-node-app && cd my-node-app`.

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Instant Toolkit

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Step-by-Step Guide

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Install Node.js and Verify Setup

Visit the official Node.js download page.
Download the LTS version (currently v24.14.0) installer for your OS (Windows, macOS, or Linux).
Run the installer and follow the prompts.

For advanced users (recommended): Use nvm (Node Version Manager):

curl -o- https://raw.githubusercontent.com/nvm-sh/nvm/v0.40.4/install.sh | bash
source ~/.bashrc  # or restart terminal
nvm install 24
nvm use 24

Open a terminal and verify:

node -v  # Should output v24.14.0 or similar
npm -v   # Should output 11.9.0 or similar

Install a code editor like VS Code. Create a project folder: mkdir my-node-app && cd my-node-app.

Why this step matters:

-Establishes a reliable runtime environment essential for all Node.js development
-Ensures you can run and test code immediately without compatibility issues

30-60 minutes

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

$0

Definition of Done

•Node.js and npm versions display correctly in terminal
•A new project folder is created and accessible

Common Mistakes to Avoid

❌ Installing the 'Current' version instead of LTS

→Always choose LTS for stability in learning and production-like environments

❌ Skipping version verification

→Run `node -v` and `npm -v` immediately after install to confirm success

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Learning Resources

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🌐 Helpful Websites

Official Node.js Documentation

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Comprehensive API reference for all built-in modules

Node.js Learn Path

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Official beginner guides on core concepts

🛠️ Useful Tools

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Visual Studio Code

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Code editor with Node.js extensions

learnyounode

Tutorial

Interactive terminal tutorial for Node.js

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