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I was trying to Base64 encode a user-provided file with JS. This is my code:

let image = document.getElementById('image').files[0];
if (!image) {
    alert('No images have been provided!');
    return;
}
let blob = new Blob([image], { type: 'image/png' });
let reader = new FileReader;
reader.addEventListener('load', loadEvent => {
    let base64EncodedImage = reader.result
        .replace('data:', '');
});

Problem is that reader.readAsDataURL(blob) always returns undefined.

Johnny_Pole
  • 21
  • 1
  • Does `reader.readAsDataURL(blob)` itself return `undefined`, or is `base64EncodedImage` `undefined`? The former is meant to return `undefined`, the data is available in the `load` event callback. – Ivar Sep 16 '21 at 19:18

0 Answers0