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Parsing the dataPoints to the format accepted by CanvasJS before passing it to chart-options should work fine in this case.

for (var i = 0; i <= result.length - 1; i++) {
  dataPoints.push({ x: Number(result[i].x), y: Number(result[i].y) });

Please take a look at this JSFiddle for rendering chart from JSON object.
column chart from JSON data

If you are still facing issue, kindly share sample project along with sample JSON over Google-Drive or Onedrive, so that we can look into it and help you out.

Vishwas R
Team CanvasJS