JS - get image width and height from the base64 code

var i = new Image(); 

i.onload = function(){
 alert( i.width+", "+i.height );
};

i.src = imageData;

For synchronous use just wrap it into a promise like this:

function getImageDimensions(file) {
  return new Promise (function (resolved, rejected) {
    var i = new Image()
    i.onload = function(){
      resolved({w: i.width, h: i.height})
    };
    i.src = file
  })
}

then you can use await to get the data in synchronous coding style:

var dimensions = await getImageDimensions(file)

JS - get image width and height from the base64 code

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