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// sending-a-file-as-multipart-through-xmlhttprequest
// change the id `USE-YOUR-ID`
const img = document.getElementById('USE-YOUR-ID');
// extracts image data from <img> element through canvas
const canvas = document.createElement('canvas');
const context = canvas.getContext('2d');
canvas.width = img.width;
canvas.height = img.height;
context.drawImage(img, 0, 0 );
const myData = context.getImageData(0, 0, img.width, img.height);
// this converts the image into base64
const str = btoa(
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