Clustering points
Visualize dense services as clusters of points with the L.markercluster plugin. More information about Feature Layers can be found in the L.esri.FeatureLayer documentation.
<html>
<head>
<meta charset="utf-8" />
<title>Clustering points</title>
<meta name="viewport" content="initial-scale=1,maximum-scale=1,user-scalable=no" />
<!-- Load Leaflet from CDN -->
<link rel="stylesheet" href="https://unpkg.com/leaflet@1.5.1/dist/leaflet.css"
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crossorigin=""/>
<script src="https://unpkg.com/leaflet@1.5.1/dist/leaflet.js"
integrity="sha512-GffPMF3RvMeYyc1LWMHtK8EbPv0iNZ8/oTtHPx9/cc2ILxQ+u905qIwdpULaqDkyBKgOaB57QTMg7ztg8Jm2Og=="
crossorigin=""></script>
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<script src="https://unpkg.com/esri-leaflet@2.3.0/dist/esri-leaflet.js"
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crossorigin=""></script>
<style>
body { margin:0; padding:0; }
#map { position: absolute; top:0; bottom:0; right:0; left:0; }
</style>
</head>
<body>
<link rel="stylesheet" type="text/css" href="https://unpkg.com/leaflet.markercluster@1.0.4/dist/MarkerCluster.Default.css">
<link rel="stylesheet" type="text/css" href="https://unpkg.com/leaflet.markercluster@1.0.4/dist/MarkerCluster.css">
<script src="https://unpkg.com/leaflet.markercluster@1.0.4/dist/leaflet.markercluster.js"></script>
<!-- Load Clustered Feature Layer from CDN -->
<script src="https://unpkg.com/esri-leaflet-cluster@2.0.0/dist/esri-leaflet-cluster.js"></script>
<div id="map"></div>
<script>
var map = L.map('map').setView([0, 0], 2);
L.esri.basemapLayer('Streets').addTo(map);
// (new constructor syntax at 2.0.0)
L.esri.Cluster.featureLayer({
url: 'https://sampleserver6.arcgisonline.com/arcgis/rest/services/Earthquakes_Since1970/MapServer/0'
}).addTo(map);
</script>
</body>
</html>