This adds a small map control to a Leaflet map. This control will toggle between clustered and unclustered pins.
This requires the MarkerCluster plugin and the MarkerCluster.Freezable sub-plugin.
The icon provides in the example is from Icons8, but is replaceable by overriding the container.style.backgroundImage option in L.Control.Cluster
Add the control to your map by including the L.Control.Cluster.js file
<script src="L.Control.Cluster.js"></script>
Then add the control to your map object
map.addControl(new L.Control.Cluster())
By default, this will be added to the upper right of your map. If you have a lot of pins, the process of clustering and declustering may take several seconds.