Hi everyone,

I've been working on developing a full-stack application using React for the front-end and Node.js for the back-end. I've been following a tutorial on Full Stack Developer: How to Become One?:https://www.interviewbit.com/blog/full-stack-developer/ However, I've encountered an issue and I could use some guidance.

I've successfully set up my React application and created the necessary components. On the server side, I have a Node.js server running, but I'm having trouble establishing the communication between the front-end and the back-end. Specifically, I'm struggling to make API calls from my React components to the Node.js server.

I've tried using the `fetch` API in my React code to send HTTP requests to the server, but I'm consistently receiving an error. Here's an example of the code I'm using:

```javascript
fetch('/api/data')
.then(response => response.json())
.then(data => {
// Process the received data
})
.catch(error => {
console.error('Error:', error);
});
```

I have a route set up on the Node.js server to handle this request, but it seems like the React application is unable to connect to it. I've double-checked the server URL and port, and they are correct.

I'm wondering if I'm missing any additional configuration or if there's a step in the tutorial that I might have overlooked. I would greatly appreciate any suggestions or insights to help me resolve this issue.

If it helps, here's the relevant code from my Node.js server:

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

app.get('/api/data', (req, res) => {
// Process the request and send response data
});

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

Any help or guidance would be highly appreciated. Thank you!