I need to create a REST API endpoint for my web application. Can you provide an example of how to do that using Node.js and Express?

Sure, here's an example of how to create a simple REST API endpoint using Node.js and Express: First, make sure you have Node.js and the Express framework installed on your machine. You can install them by running the following commands: ``` npm install node npm install express ``` Then, create a new file called `server.js` and add the following code: ```javascript const express = require('express'); const app = express(); // Define a GET endpoint app.get('/api/hello', (req, res) => { res.send('Hello World!'); }); // Start the server const port = process.env.PORT || 3000; app.listen(port, () => { console.log(`Server is listening on port ${port}`); }); ``` In this example, we're creating a simple REST API endpoint that responds to a GET request to `/api/hello` with a "Hello World!" message. To start the server, run the following command: ``` node server.js ``` You should see the message "Server is listening on port 3000" in the console. You can then access the API endpoint by navigating to `http://localhost:3000/api/hello` in your web browser or using a tool like cURL or Postman. That's it! You've created a simple REST API endpoint using Node.js and Express.