Intro To Express JS in Under 40 Minutes – Tutorial

If you’re looking to learn about Express JS, you’ve come to the right place! In this tutorial, we’ll guide you through the basics of Express JS and show you how to get started with building your own web application. And the best part? You can do it in under 40 minutes!

What is 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 is designed to make building web applications and APIs much simpler, faster, and more enjoyable.

Getting Started

To get started with Express JS, you’ll need to have Node.js installed on your computer. Once you have Node.js installed, you can use the following command to install Express:

npm install express

Once Express is installed, you can create a new Express application using the following code:

const express = require('express');
const app = express();

Creating Routes

Routes are used to define how your application responds to client requests. With Express JS, you can easily create routes using the following syntax:

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

This code creates a route that responds to HTTP GET requests on the root URL (‘/’). When a client makes a GET request to the root URL, the server will respond with ‘Hello, World!’.

Middleware

Middleware functions are functions that have access to the request object (req), the response object (res), and the next function in the application’s request-response cycle. They are an essential part of any Express application, and can be used to perform tasks such as logging, authentication, and error handling.

Conclusion

Express JS is a powerful and versatile framework for building web applications and APIs. In this tutorial, we covered the basics of Express JS, including how to get started, creating routes, and using middleware. With this knowledge, you’re well on your way to building your own web applications with Express JS.