When trying to use the ImageKit API on my server side, I keep getting the following error: XMLHttpRequest is not defined. I have installed xmlhttprequest with npm and tried require('xmlhttprequest') and require('xmlhttprequest').XMLHttpRequest, but neither has worked. What can I do here?

Here is the backend upload method straight from the documentation. Even using just this version (replacing the ImageKit fields with my personal ones) gave the same error. I am trying to upload from my server-side, which supposedly this method is designed for.

var ImageKit = require("imagekit");
var fs = require('fs');

var imagekit = new ImageKit({
    publicKey : "your_public_api_key",
    privateKey : "your_private_api_key",
    urlEndpoint : "https://ik.imagekit.io/your_imagekit_id/"
});

var base64Img = "iVBORw0KGgoAAAAN";

imagekit.upload({
    file : base64Img, //required
    fileName : "my_file_name.jpg",   //required
    tags: ["tag1","tag2"]
}, function(error, result) {
    if(error) console.log(error);
    else console.log(result);
});