decrypt base64 code example

Example 1: buffer from base64

const b64string = /* whatever */;
const buf = Buffer.from(b64string, 'base64');

Example 2: base64

function getBase64(file:any) {
    return new Promise((resolve, reject) => {
      const reader = new FileReader();
      reader.readAsDataURL(file);
      reader.onload = () => resolve(reader.result);
      reader.onerror = error => reject(error);
    });
  }