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Back-End Tutorial
In this tutorial, we will learn how to create a backend server using Express JS in Node JS. Express is a minimal and flexible Node.js web application framework that provides a robust set of features for web and mobile applications.
What is Express JS?
Express is a popular Node.js web application framework that simplifies the process of building server-side applications. It provides a simple and intuitive API for building web applications and APIs.
Getting Started
Before we can create our backend server using Express, we need to install Node.js and NPM (Node Package Manager) on our computer. Node.js is a JavaScript runtime that allows you to run JavaScript code outside of a web browser.
“`
$ npm install express
“`
Creating a Backend Server
Now that we have installed Express, we can create our backend server. Create a new file called `server.js` and add the following code:
“`javascript
const express = require(‘express’);
const app = express();
app.get(‘/’, (req, res) => {
res.send(‘Hello, World!’);
});
app.listen(3000, () => {
console.log(‘Server is running on http://localhost:3000’);
});
“`
Running the Server
To run our backend server, open a terminal window, navigate to the directory where `server.js` is located, and type the following command:
“`
$ node server.js
“`
Now open a web browser and navigate to `http://localhost:3000`. You should see the message “Hello, World!” displayed on the screen.
Conclusion
Congratulations! You have successfully created a backend server using Express JS in Node JS. Express makes it easy to build powerful and scalable web applications, and it is widely used by developers around the world.
