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ArcGIS API is using this Demo to illustrate how Point clustering works with JSON data. In my case I am generating some point graphics from MySQL Database by a jQuery AJAX request like following code: As you can see I am storing the data in project and then access to project.Longitude, project.Latitude to create the points

request.done(function( mapInfo) {
    for (var i = 0; i < mapInfo.length; i++) {
            var project = mapInfo[i];
            var point = new Point(project.Longitude, project.Latitude); 
            var pointSymbol = new SimpleMarkerSymbol(); 
            pointSymbol.setStyle(SimpleMarkerSymbol.STYLE_CIRCLE);
            pointSymbol.setSize(12);
            var pointInfoTemplate = new InfoTemplate(); 
            pointInfoTemplate.setTitle("Project Details");
            pointInfoTemplate.setContent('//JSON Data');
            var pointGraphic = new Graphic(point, pointSymbol).setInfoTemplate(pointInfoTemplate);
            points.push(pointGraphic);
}
for (i = 0; i < points.length; ++i) {
        map.graphics.add(points[i]);
}
});`

How can I bind this points with Cluster Points in ArcGIS API sample?

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In your example code you have lat and lon. In the sample that you linked to, in the function addClusters is where you can use that same lat/lon:

screenshot from https://developers.arcgis.com/javascript/jssamples/layers_point_clustering.html

So basically if you follow the sample, putting in your lat/lon in the place I highlighted above, it should work for you.

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