Ember user upload excel to csv - blank

With ember I am currently letting the user upload files through the ember-file-upload package and trying to parse excel files with the xlsx package but I can't seem to get them to work together. I have gotten other packages to convert the file to csv, json, etc. but can't seem to get the excel file upload to convert with xlsx and I can't seem to find any other packages that work.

I am currently trying to do it this way but it always appears empty.

     file.onloadstart = function (e) {
          alert("started reading");
      }

        file.onload = function (e) {
        // pre-process data
        var binary = "";
        var bytes = new Uint8Array(e.target.result);
        var length = bytes.byteLength;
        for (var i = 0; i < length; i++) {
            binary += String.fromCharCode(bytes[i]);
        }
        // call 'xlsx' to read the file
        var workbook = XLSX.read(binary, {type: 'binary', cellDates:true, cellStyles:true});
        //return oFile;
        alert(workbook.SheetNames.length);
        alert(workbook.SheetNames[0]);
        var worksheet = workbook.Sheets[workbook.SheetNames[0]];

        var desiredCell = worksheet['A1'];
        var desiredValue = (desiredCell ? desiredCell.v : undefined);
        alert(desiredValue);
    };



 file.readAsArrayBuffer().then(function(data) {
       alert(XLSX.utils.sheet_to_csv(data));
         csv2geojson.csv2geojson(data, function(err, jsondata) {
             // do something
         });
     });

Currently file.onloadstart never gets called and neither does file.onload but when I tested outside of those the workbook.SheetNames.length alerts the wrong length the workbook.SheetNames[0] gives a bad sheetname and the desiredValue alert is blank along with alerting XLSX.utils.sheet_to_csv(data) alert is blank and with length 0.