Lecture 245:- Setting Up Express Server

To set up an Express server, follow these steps:

1. Open your terminal and navigate to the root directory of your project.
2. Create a new file called app.js (or any other name you prefer) and open it in your code editor.
3. Install the Express module by running the following command in your terminal:

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npm install express

1. In your app.js file, import the Express module and create an instance of the express() function:

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

1. Define a route by calling one of the HTTP methods (get, post, put, delete, etc.) on your app object:

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

In the example above, we're defining a GET route for the root URL (/) and sending the response "Hello, World!" back to the client.

1. Start the server by calling the listen method on your app object and passing in a port number:

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

In the example above, we're starting the server on port 3000 and logging a message to the console to confirm that the server has started.

1. Run your server by running the following command in your terminal:

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node app.js

Your server should now be running and accessible at http://localhost:3000 in your web browser.

This is a basic example of setting up an Express server. You can define more routes, middleware, and templates to build more complex web applications.