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Exporting chart data as excel / CSV is not available as an inbuilt feature as of now. However with few lines of code, you can convert chart data into comma-separated CSV and download it. Please find the code snippet for the same below.

function convertChartDataToCSV(args) {  
  var result, ctr, keys, columnDelimiter, lineDelimiter, data;

  data = args.data || null;
  if (data == null || !data.length) {
    return null;

  columnDelimiter = args.columnDelimiter || ',';
  lineDelimiter = args.lineDelimiter || '\n';

  keys = Object.keys(data[0]);

  result = '';
  result += keys.join(columnDelimiter);
  result += lineDelimiter;

  data.forEach(function(item) {
    ctr = 0;
    keys.forEach(function(key) {
      if (ctr > 0) result += columnDelimiter;
      result += item[key];
    result += lineDelimiter;
  return result;

Please take a look at this JSFiddle for fully functional example on exporting chart data as CSV. Also take a look at this plugin, which does the same.
exporting chart data as csv

If this doesn’t help you, kindly share working sample project along with sample database over Google-Drive or Onedrive so that we can try running it locally, understand your scenario better and help you out.

Vishwas R
Team CanvasJS