Backend Workshop with Express

What is Express?

Express is a backend framework which is a server side technology that connects to the database. Basically, a browser or a frontend framework will make a request to the backend framework to perform some action which might be reflected in the database.

Why use Express?

• Light, Fast, Free
• Convenient way to build NodeJS app
• Community-driven, a lot of helper libraries

Node Installation

1. Download node from NodeJS
2. Choose the recommended version
3. Run the wizard
4. Use node -v on command prompt to ensure that the installation has been done completely

Creating a Node App

1. Create a folder in your preferred directory
2. Open the folder in VSCode
3. Open terminal
4. Type the following command: npm init -y npm install express --save npm install nodemon --save-dev

Hello World

Create a new file named index.js const express = require('express'); const app = express(); const port = 3000;

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

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

Go to package.json and add a new script "start": "nodemon index.js"

Type npm run start in the terminal to run your app