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Marker Clustering

  • This code demonstrates marker clustering on a map using the Google Maps JavaScript API.

  • It imports necessary libraries for maps, markers, and marker clustering.

  • Markers are created with alphabetical labels and clustered for better visualization.

  • An info window displays the latitude and longitude when a marker is clicked.

  • The sample can be run locally with Git and Node.js or tried directly in Google Cloud Shell.

Read thedocumentation.

TypeScript

import{MarkerClusterer}from"@googlemaps/markerclusterer";asyncfunctioninitMap(){// Request needed libraries.const{Map,InfoWindow}=awaitgoogle.maps.importLibrary("maps")asgoogle.maps.MapsLibrary;const{AdvancedMarkerElement,PinElement}=awaitgoogle.maps.importLibrary("marker")asgoogle.maps.MarkerLibrary;constmap=newgoogle.maps.Map(document.getElementById("map")asHTMLElement,{zoom:3,center:{lat:-28.024,lng:140.887},mapId:'DEMO_MAP_ID',});constinfoWindow=newgoogle.maps.InfoWindow({content:"",disableAutoPan:true,});// Create an array of alphabetical characters used to label the markers.constlabels="ABCDEFGHIJKLMNOPQRSTUVWXYZ";// Add some markers to the map.constmarkers=locations.map((position,i)=>{constlabel=labels[i%labels.length];constpinGlyph=newgoogle.maps.marker.PinElement({glyph:label,glyphColor:"white",})constmarker=newgoogle.maps.marker.AdvancedMarkerElement({position,content:pinGlyph.element,});// markers can only be keyboard focusable when they have click listeners// open info window when marker is clickedmarker.addListener("click",()=>{infoWindow.setContent(position.lat+", "+position.lng);infoWindow.open(map,marker);});returnmarker;});// Add a marker clusterer to manage the markers.newMarkerClusterer({markers,map});}constlocations=[{lat:-31.56391,lng:147.154312},{lat:-33.718234,lng:150.363181},{lat:-33.727111,lng:150.371124},{lat:-33.848588,lng:151.209834},{lat:-33.851702,lng:151.216968},{lat:-34.671264,lng:150.863657},{lat:-35.304724,lng:148.662905},{lat:-36.817685,lng:175.699196},{lat:-36.828611,lng:175.790222},{lat:-37.75,lng:145.116667},{lat:-37.759859,lng:145.128708},{lat:-37.765015,lng:145.133858},{lat:-37.770104,lng:145.143299},{lat:-37.7737,lng:145.145187},{lat:-37.774785,lng:145.137978},{lat:-37.819616,lng:144.968119},{lat:-38.330766,lng:144.695692},{lat:-39.927193,lng:175.053218},{lat:-41.330162,lng:174.865694},{lat:-42.734358,lng:147.439506},{lat:-42.734358,lng:147.501315},{lat:-42.735258,lng:147.438},{lat:-43.999792,lng:170.463352},];initMap();
Note: Read theguide on using TypeScript and Google Maps.

JavaScript

import{MarkerClusterer}from"@googlemaps/markerclusterer";asyncfunctioninitMap(){// Request needed libraries.const{Map,InfoWindow}=awaitgoogle.maps.importLibrary("maps");const{AdvancedMarkerElement,PinElement}=awaitgoogle.maps.importLibrary("marker",);constmap=newgoogle.maps.Map(document.getElementById("map"),{zoom:3,center:{lat:-28.024,lng:140.887},mapId:"DEMO_MAP_ID",});constinfoWindow=newgoogle.maps.InfoWindow({content:"",disableAutoPan:true,});// Create an array of alphabetical characters used to label the markers.constlabels="ABCDEFGHIJKLMNOPQRSTUVWXYZ";// Add some markers to the map.constmarkers=locations.map((position,i)=>{constlabel=labels[i%labels.length];constpinGlyph=newgoogle.maps.marker.PinElement({glyph:label,glyphColor:"white",});constmarker=newgoogle.maps.marker.AdvancedMarkerElement({position,content:pinGlyph.element,});// markers can only be keyboard focusable when they have click listeners// open info window when marker is clickedmarker.addListener("click",()=>{infoWindow.setContent(position.lat+", "+position.lng);infoWindow.open(map,marker);});returnmarker;});// Add a marker clusterer to manage the markers.newMarkerClusterer({markers,map});}constlocations=[{lat:-31.56391,lng:147.154312},{lat:-33.718234,lng:150.363181},{lat:-33.727111,lng:150.371124},{lat:-33.848588,lng:151.209834},{lat:-33.851702,lng:151.216968},{lat:-34.671264,lng:150.863657},{lat:-35.304724,lng:148.662905},{lat:-36.817685,lng:175.699196},{lat:-36.828611,lng:175.790222},{lat:-37.75,lng:145.116667},{lat:-37.759859,lng:145.128708},{lat:-37.765015,lng:145.133858},{lat:-37.770104,lng:145.143299},{lat:-37.7737,lng:145.145187},{lat:-37.774785,lng:145.137978},{lat:-37.819616,lng:144.968119},{lat:-38.330766,lng:144.695692},{lat:-39.927193,lng:175.053218},{lat:-41.330162,lng:174.865694},{lat:-42.734358,lng:147.439506},{lat:-42.734358,lng:147.501315},{lat:-42.735258,lng:147.438},{lat:-43.999792,lng:170.463352},];initMap();
Note: The JavaScript is compiled from the TypeScript snippet.

CSS

/* * Always set the map height explicitly to define the size of the div element * that contains the map. */#map{height:100%;}/* * Optional: Makes the sample page fill the window. */html,body{height:100%;margin:0;padding:0;}

HTML

<html>  <head>    <title>Marker Clustering</title>    <link rel="stylesheet" type="text/css" href="./style.css" />    <script type="module" src="./index.js"></script>  </head>  <body>    <div></div>    <!-- prettier-ignore -->    <script>(g=>{var h,a,k,p="The Google Maps JavaScript API",c="google",l="importLibrary",q="__ib__",m=document,b=window;b=b[c]||(b[c]={});var d=b.maps||(b.maps={}),r=new Set,e=new URLSearchParams,u=()=>h||(h=new Promise(async(f,n)=>{await (a=m.createElement("script"));e.set("libraries",[...r]+"");for(k in g)e.set(k.replace(/[A-Z]/g,t=>"_"+t[0].toLowerCase()),g[k]);e.set("callback",c+".maps."+q);a.src=`https://maps.${c}apis.com/maps/api/js?`+e;d[q]=f;a.onerror=()=>h=n(Error(p+" could not load."));a.nonce=m.querySelector("script[nonce]")?.nonce||"";m.head.append(a)}));d[l]?console.warn(p+" only loads once. Ignoring:",g):d[l]=(f,...n)=>r.add(f)&&u().then(()=>d[l](f,...n))})        ({key: "AIzaSyB41DRUbKWJHPxaFjMAwdrzWzbVKartNGg", v: "weekly"});</script>  </body></html>

Try Sample

Clone Sample

Git and Node.js are required to run this sample locally. Follow theseinstructions to install Node.js and NPM. The following commands clone, install dependencies and start the sample application.

gitclone-bsample-marker-clusteringhttps://github.com/googlemaps/js-samples.gitcdjs-samplesnpminpmstart

Other samples can be tried by switching to any branch beginning withsample-SAMPLE_NAME.

gitcheckoutsample-SAMPLE_NAMEnpminpmstart

Except as otherwise noted, the content of this page is licensed under theCreative Commons Attribution 4.0 License, and code samples are licensed under theApache 2.0 License. For details, see theGoogle Developers Site Policies. Java is a registered trademark of Oracle and/or its affiliates.

Last updated 2025-11-21 UTC.