Lecture 283:- Starting Express

To start an Express.js application, we first need to create a new directory and initialize it with npm. We can do this using the following steps:

1. Create a new directory for your project.

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   mkdir my-express-app cd my-express-app

2. Initialize npm in the project directory by running the following command and following the prompts:

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   npm init

3. Install the Express.js module by running the following command in your project directory:

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   npm install express

4. Create a new file named app.js in your project directory.

5. Add the following code to your app.js file to create a new Express application:

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   const express = require('express'); const app = express(); // Define routes here // Start the server const port = 3000; app.listen(port, () => {  console.log(`Server running on port ${port}`); });

   This code imports the Express.js module, creates a new Express application using the express() function, defines routes, and starts the server.

6. Run the following command to start the Express.js server:

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   node app.js

   This will start the server and output a message in the console indicating that the server is running. You can then access the server at http://localhost:3000 in your web browser.