expressjsHow do I use Yarn to add Express.js to my project?

Adding Express.js to a project using Yarn is a simple process. First, install Express.js within the project directory by running the command yarn add express in the terminal. This will add Express.js to the project's dependencies in package.json.

Next, create an index.js file in the project directory. This file will be used to start the Express.js server.

In the index.js file, include the following code:

const express = require('express');

const app = express();

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

app.listen(3000, () => {
  console.log('Server is listening on port 3000');
});

This code will create an Express.js server on port 3000 which will respond to GET requests to the root route (/) with the string Hello World!.

To start the server, run the command yarn start in the terminal. This will start the Express.js server and you should see the following output in the terminal:

Server is listening on port 3000

Now you can make GET requests to the root route (/) and receive the response Hello World!.

Parts of the code:

• const express = require('express');: This line imports the Express.js module in order to use its functionality.
• const app = express();: This line creates an Express.js application.
• app.get('/', (req, res) => {...});: This line creates a GET route on the root route (/) which will respond to GET requests with the string Hello World!.
• app.listen(3000, () => {...});: This line starts the Express.js server on port 3000.

Helpful links

• Yarn Documentation
• Express.js Documentation

Edit this code on GitHub