data2url.js

var url = "[urls]";
fetch(url).then((res)=>{
  
  console.log(o=res)
  return res.blob();
}).then((data)=>{
  console.log('blob', data)
  var Fr = new FileReader;
  Fr.readAsDataURL(data)
  Fr.onload = ()=>{
    console.log('data',Fr.result)
  }
})