dwv.dicom. DicomParser

// XMLHttpRequest onload callback
var onload = function (event) {
  // setup the dicom parser
  var dicomParser = new dwv.dicom.DicomParser();
  // parse the buffer
  dicomParser.parse(event.target.response);
  // get the wrapped dicom tags
  // (raw tags are available via 'getRawDicomElements')
  var tags = dicomParser.getDicomElements();
  // display the modality
  var div = document.getElementById('dwv');
  div.appendChild(document.createTextNode(
    'Modality: ' + tags.getFromName('Modality')
  ));
};
// DICOM file request
var request = new XMLHttpRequest();
var url = 'https://raw.githubusercontent.com/ivmartel/dwv/master/tests/data/bbmri-53323851.dcm';
request.open('GET', url);
request.responseType = 'arraybuffer';
request.onload = onload;
request.send();