Introduction

Node.js and Express.js have become foundational tools for many developers across the globe. If you're stepping into the realm of backend development, understanding these technologies is essential. In this guide, we will explore the basics of both, helping you to create your first server-side application.

Understanding Node.js

Node.js is an open-source, cross-platform runtime environment that executes JavaScript code outside a web browser, typically on the server-side. Built on Chrome's V8 JavaScript engine, it's designed to build scalable network applications.

Setting Up Node.js Environment

Before you start coding, you need to set up Node.js on your system. Here's a quick guide:

• Visit Node.js official website.
• Download the LTS version compatible with your operating system.
• Follow the installation prompts.

Once installed, verify the installation with:

node -v

This command checks for the installed Node.js version.

Hello World in Node.js

Create a simple Node.js application:

/* hello.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 running at http://${hostname}:${port}/`);
});

Run this using:

node hello.js

Navigate to http://127.0.0.1:3000 in a browser to see the output.

Introduction to Express.js

Express.js is a minimal and flexible Node.js web application framework that provides a robust set of features for web and mobile applications. It simplifies the server creation process.

Building a Basic Server with Express.js

To start with Express, you need to install it using npm:

npm install express

Create a basic server:

/* app.js */
const express = require('express');
const app = express();
const port = 3000;

app.get('/', (req, res) => {
  res.send('Hello World!');
});

app.listen(port, () => {
  console.log(`Express app listening at http://localhost:${port}`);
});

Run your server using:

node app.js

Visit http://localhost:3000 to see your Express server in action.

FAQ

What is Node.js used for?

Node.js is used for building scalable and efficient network applications, particularly suited for I/O-heavy operations.

What makes Express.js popular?

Express.js is popular due to its minimalistic framework, offering flexibility, robust features, and simplicity for developing web applications.

Is npm required to use Node.js?

Yes, npm (Node Package Manager) comes bundled with Node.js and is essential for managing your project's dependencies.

Conclusion

Node.js and Express.js are powerful tools that simplify the development of web applications. With this guide, you should have a foundational understanding to start your journey. Keep experimenting and exploring their extensive ecosystems!