Fix: ReferenceError: XMLHttpRequest is not defined when calling firestore DB from Next.js API routes

 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.

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