The error message "ReferenceError: XMLHttpRequest is not defined" typically indicates that you're trying to use the `XMLHttpRequest` object in a server-side context, such as a Next.js API route. `XMLHttpRequest` is a client-side object used for making HTTP requests in web browsers and is not available in server-side JavaScript or Node.js.
If you are trying to make an HTTP request to Firestore from a Next.js API route, you should use a library like `node-fetch` or `axios` to perform the HTTP request. Here's an example of how to use `node-fetch` in a Next.js API route to access Firestore:
1. First, make sure you have `node-fetch` installed in your Next.js project:
```bash
npm install node-fetch
```
2. In your Next.js API route, use `node-fetch` to make the Firestore request:
```javascript
import fetch from 'node-fetch';
export default async (req, res) => {
try {
// Define your Firestore API URL
const firestoreUrl = 'https://firestore.googleapis.com/v1/projects/your-project-id/databases/(default)/documents/your-collection/your-document';
// Make a GET request to Firestore
const response = await fetch(firestoreUrl);
if (response.ok) {
const data = await response.json();
res.status(200).json(data);
} else {
console.error('Firestore request failed:', response.status, response.statusText);
res.status(500).json({ error: 'Firestore request failed' });
}
} catch (error) {
console.error('Error:', error);
res.status(500).json({ error: 'Internal server error' });
}
};
```
Replace `your-project-id`, `your-collection`, and `your-document` with the appropriate values for your Firestore data.
This example demonstrates how to use `node-fetch` to make an HTTP request from a Next.js API route. Remember that Firestore may require authentication, and you should ensure that your Firestore security rules allow the request from your Next.js application.