Node.js Express Setup

1. Install Node.js

Before using Express, you need to have Node.js installed. Download the latest version from the official Node.js website:

2. Initialize a Node.js Project

Create a new directory for your project and run the following command to initialize your Node.js project:

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npm init -y

This command generates a package.json file, which will manage your project's dependencies.

3. Install Express

Once your Node.js project is initialized, you can install Express using npm. Run the following command:

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npm install express

This will install Express in your project directory.

4. Set Up a Simple Express Server

Now, create a file called app.js in your project folder and add the following code to set up your basic server:

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

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

app.listen(3000, () => {
    console.log('Server is running on http://localhost:3000');
});

This code sets up an Express server that listens on port 3000 and responds with "Hello World" at the root route.

5. Run the Server

To start your server, run the following command:

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node app.js

Once the server is running, open your browser and go to http://localhost:3000. You should see "Hello World" displayed on the page.

6. Conclusion

You've now successfully set up a basic Node.js application with Express! You can start building more complex applications by adding routes, middleware, and other features.