Quick and dirty client-side script to download names and titles from a Slack channel

download_user_data_from_slack.js

// In the Web UI for Slack, navigate to a channel, click on "See All Members" 
// and then scroll until you've hit the end of the list
// Open your browser's console and run this


var NameAndTitles = document.getElementsByClassName('c-base_entity__text-contents')

var NamesData = [];
for (var i=0; i < NameAndTitles.length; i++) {
    var title = NameAndTitles[i].getElementsByClassName('c-member__title')[0];
    var person = NameAndTitles[i].getElementsByClassName('c-member_name')[0];
    var title_str = '';
    var person_str = '';
    if (title) { title_str = title.textContent };
    if (name) { person_str = person.textContent };
    NamesData[i] = [ person_str, title_str ];
    console.log(NamesData[i]);
}

var data = NamesData;
// https://stackoverflow.com/questions/14964035/how-to-export-javascript-array-info-to-csv-on-client-side#24922761
// Building the CSV from the Data two-dimensional array
// Each column is separated by ";" and new line "\n" for next row
var csvContent = '';
data.forEach(function(infoArray, index) {
  dataString = infoArray.join(';');
  csvContent += index < data.length ? dataString + '\n' : dataString;
});

// The download function takes a CSV string, the filename and mimeType as parameters
// Scroll/look down at the bottom of this snippet to see how download is called
var download = function(content, fileName, mimeType) {
  var a = document.createElement('a');
  mimeType = mimeType || 'application/octet-stream';

  if (navigator.msSaveBlob) { // IE10
    navigator.msSaveBlob(new Blob([content], {
      type: mimeType
    }), fileName);
  } else if (URL && 'download' in a) { //html5 A[download]
    a.href = URL.createObjectURL(new Blob([content], {
      type: mimeType
    }));
    a.setAttribute('download', fileName);
    document.body.appendChild(a);
    a.click();
    document.body.removeChild(a);
  } else {
    location.href = 'data:application/octet-stream,' + encodeURIComponent(content); // only this mime type is supported
  }
}

download(csvContent, 'dowload.csv', 'text/csv;encoding:utf-8');