Install Express in a Node Project

Express.js is a lightweight Node.js framework that simplifies building web applications and APIs, offering routing, middleware, and easy database integration.

Before adding Express to your project, ensure that NodeJS is installed on your system. For detailed installation instructions, you can refer to this guide: --> Here

Setting Up Express

Here are the steps to set up Express in your Node.js project:

Step 1: Navigate to Your Project Directory

Open your terminal or command prompt and move to your project's root directory

cd path-to-your-porject

Step 2: Initialize the NodeJS Project

Set up your project by creating a package.json file

npm init -y

This command initializes the project with default settings, creating a package.json file that manages your project's dependencies and metadata.

Step 3: Install ExpressJS

Add ExpressJS to your project

npm install express

This installs the ExpressJS framework and adds it to the dependencies section of your package.json.

Step 4: Create a Basic Express Server

In your project directory, create a file named app.js and add the following code

const express = require('express');
const app = express();
const PORT = 3000;

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

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

Step 5: Start the Server

Run your server with the following command

node server.js

Terminal Output

Web Browser Output

When you navigate to http://localhost:3000 in your web browser, you should see:

Suggested Quiz

Edit Quiz

4 Questions

What is the primary purpose of running the command below before installing Express?

npm init -y

• A

  To install Express globally
  

• B

  To create a default package.json file

• C

  To start the Express server

• D

  To verify Node.js installation

Explanation:

The npm init -y command initializes a Node.js project by creating a package.json file with default values. This file manages project metadata and dependencies like Express.

Which of the following best describes what happens when you run the command below?

npm install express

• A

  Express is installed globally on the system
  

• B

  Express is added to the devDependencies section

• C

  Express is added to the dependencies section of package.json

• D

  Express replaces Node.js in the project

Explanation:

Running npm install express installs Express locally in the project and adds it to the dependencies section of package.json, ensuring it is available in production.

Which line in the Express server code is responsible for starting the server and listening for requests?

• A

  const app = express();
  

• B

  app.get('/', (req, res) => {...});

• C

  app.listen(PORT, () => {...});

• D

  require('express');

Explanation:

The app.listen() method binds the application to a specific port and starts the server, allowing it to listen for incoming HTTP requests.

After creating the Express server file, which command is used to start the server?

• A

  npm start
  

• B

  node app.js

• C

  express start

• D

  npm install express

Explanation:

The command node app.js executes the JavaScript file containing the Express server code, starting the server and making it accessible at http://localhost:3000.

Quiz Completed Successfully

Your Score :   2/4

Accuracy :  0%

Login to View Explanation

1/4 1/4 < Previous Next >