Node.js Tutorial

Master Node.js fundamentals with our comprehensive tutorial. Learn through examples and hands-on practice.

Video Tutorial

Introduction to Node.js

Node.js is a JavaScript runtime built on Chrome's V8 JavaScript engine that allows you to run JavaScript on the server side.

Examples:

console.log('Hello from Node.js');

// Basic HTTP Server
const http = require('http');

const server = http.createServer((req, res) => {
  res.writeHead(200, { 'Content-Type': 'text/plain' });
  res.end('Hello World
');
});

server.listen(3000, () => {
  console.log('Server running at http://localhost:3000/');
});

A simple Node.js HTTP server example

Node.js Modules

Node.js uses a modular system to organize code into reusable components.

Examples:

// math.js
module.exports = {
  add: (a, b) => a + b,
  subtract: (a, b) => a - b,
  multiply: (a, b) => a * b
};

// main.js
const math = require('./math');
console.log(math.add(5, 3));      // Output: 8
console.log(math.multiply(2, 4)); // Output: 8

Creating and using custom modules in Node.js

Async Programming in Node.js

Node.js excels at handling asynchronous operations using callbacks, promises, and async/await.

Examples:

// Using async/await
const fs = require('fs').promises;

async function readFile() {
  try {
    const data = await fs.readFile('example.txt', 'utf8');
    console.log(data);
  } catch (error) {
    console.error('Error reading file:', error);
  }
}

readFile();

Reading a file asynchronously using async/await