Open the terminal or command prompt on your computer.
Navigate to the directory where your Node.js project is located.
Install the "express" package using the Node Package Manager (npm) by running the command "npm install express" in the terminal.
Once the installation is complete, create a new file in your project directory and name it "app.js" or "server.js".
In the newly created file, require the "express" module using the following line of code: "const express = require('express');"
Next, create an instance of the Express application by calling "express()" and storing the result in a variable, for example: "const app = express();"
Now, you can set up a basic route using the following syntax: "app.get('/', (req, res) => { res.send('Hello, World!'); });" This code sets up a route for the root URL that sends a simple message to the browser.
Finally, start the server by adding the following line of code: "app.listen(3000, () => { console.log('Server is running on port 3000'); });" This will start a server on port 3000 and log a message to the console indicating that the server is running.