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.
<!DOCTYPE html>
<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@1.7.1/dist/leaflet.css"
    integrity="sha512-xodZBNTC5n17Xt2atTPuE1HxjVMSvLVW9ocqUKLsCC5CXdbqCmblAshOMAS6/keqq/sMZMZ19scR4PsZChSR7A=="
    crossorigin=""/>
  <script src="https://unpkg.com/leaflet@1.7.1/dist/leaflet.js"
    integrity="sha512-XQoYMqMTK8LvdxXYG3nZ448hOEQiglfqkJs1NOQV44cWnUrBc8PkAOcXy20w0vlaXaVUearIOBhiXZ5V3ynxwA=="
    crossorigin=""></script>

  <!-- Load Esri Leaflet from CDN -->
  <script src="https://unpkg.com/esri-leaflet@3.0.8/dist/esri-leaflet.js"
    integrity="sha512-E0DKVahIg0p1UHR2Kf9NX7x7TUewJb30mxkxEm2qOYTVJObgsAGpEol9F6iK6oefCbkJiA4/i6fnTHzM6H1kEA=="
    crossorigin=""></script>

  <!-- Load Esri Leaflet Vector from CDN -->
  <script src="https://unpkg.com/esri-leaflet-vector@3.1.3/dist/esri-leaflet-vector.js"
    integrity="sha512-2sbebld2cAnzUw4nloopGcKE7AGl7xUlCXg8amUWS47veGTKMH6tx1VsT7U9ukwXPAVzecigXK0jMtS5UcllDg=="
    crossorigin=""></script>

  <!-- Load Leaflet MarkerCluster and Esri Leaflet Cluster from CDN -->
  <link rel="stylesheet" type="text/css"
    href="https://unpkg.com/leaflet.markercluster@1.5.0/dist/MarkerCluster.Default.css"
    integrity="sha512-6ZCLMiYwTeli2rVh3XAPxy3YoR5fVxGdH/pz+KMCzRY2M65Emgkw00Yqmhh8qLGeYQ3LbVZGdmOX9KUjSKr0TA=="
    crossorigin="">
  <link rel="stylesheet" type="text/css" href="https://unpkg.com/leaflet.markercluster@1.5.0/dist/MarkerCluster.css"
    integrity="sha512-mQ77VzAakzdpWdgfL/lM1ksNy89uFgibRQANsNneSTMD/bj0Y/8+94XMwYhnbzx8eki2hrbPpDm0vD0CiT2lcg=="
    crossorigin="">
  <script src="https://unpkg.com/leaflet.markercluster@1.5.0/dist/leaflet.markercluster.js"
    integrity="sha512-pWPELjRaw2ZdoT0PDi7iRpRlk1XX3rtnfejJ/HwskyojpHei+9hKpwdphC4yssNt4FM0TjMQOmMrk6ZYSn274w=="
    crossorigin=""></script>
  <script src="https://unpkg.com/esri-leaflet-cluster@3.0.0/dist/esri-leaflet-cluster.js"
    integrity="sha512-XFCzSxay1bEwLt/pTNuKEw11WbMGlWUqSLMGUtsle2Zbddt2C5uf18w0HeHbc0NP9BTFy1Mzhab7Bkr+nxp34g=="
    crossorigin=""></script>

  <style>
    body { margin:0; padding:0; }
    #map { position: absolute; top:0; bottom:0; right:0; left:0; }
  </style>
</head>
<body>

<div id="map"></div>

<script>
  var map = L.map('map', {
    maxZoom: 18 // the clustering plugin needs some help understanding the map's maxZoom
  }).setView([0, 0], 2);

  L.esri.Vector.vectorBasemapLayer('ArcGIS:Community', {
    apikey: apiKey // Replace with your API key - https://developers.arcgis.com
  }).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>
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