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To load the JavaScript code for the Maps JavaScript API, you include a bootstrap loader script on your page, of the following form:

<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: "YOUR_API_KEY",
    v: "weekly",
    // Use the 'v' parameter to indicate the version to use (weekly, beta, alpha, etc.).
    // Add other bootstrap parameters as needed, using camel case.
  });
</script>

The Maps JavaScript API is made up of libraries that are not loaded until you specifically request them. Breaking up components into libraries allows the API to load (and parse) quickly. You only incur the additional overhead of loading and parsing libraries as you need them.

Load additional libraries at runtime, by using the await operator to call importLibrary() from within an async function. For example:

const { Map } = await google.maps.importLibrary("maps");

The following code example shows loading both the Map and AdvancedMarkerElement libraries:

// Initialize and add the map
let map;
async function initMap(): Promise<void> {
  // The location of Uluru
  const position = { lat: -25.344, lng: 131.031 };

  // Request needed libraries.
  //@ts-ignore
  const { Map } = await google.maps.importLibrary("maps") as google.maps.MapsLibrary;
  const { AdvancedMarkerElement } = await google.maps.importLibrary("marker") as google.maps.MarkerLibrary;

  // The map, centered at Uluru
  map = new Map(
    document.getElementById('map') as HTMLElement,
    {
      zoom: 4,
      center: position,
      mapId: 'DEMO_MAP_ID',
    }
  );

  // The marker, positioned at Uluru
  const marker = new AdvancedMarkerElement({
    map: map,
    position: position,
    title: 'Uluru'
  });
}

initMap();
index.ts

// Initialize and add the map
let map;

async function initMap() {
  // The location of Uluru
  const position = { lat: -25.344, lng: 131.031 };
  // Request needed libraries.
  //@ts-ignore
  const { Map } = await google.maps.importLibrary("maps");
  const { AdvancedMarkerElement } = await google.maps.importLibrary("marker");

  // The map, centered at Uluru
  map = new Map(document.getElementById("map"), {
    zoom: 4,
    center: position,
    mapId: "DEMO_MAP_ID",
  });

  // The marker, positioned at Uluru
  const marker = new AdvancedMarkerElement({
    map: map,
    position: position,
    title: "Uluru",
  });
}

initMap();
index.js

Available Libraries

The following libraries are available for use with dynamic library import and direct script loading tag:

• core (google.maps.CoreLibrary)
• maps (google.maps.MapsLibrary)
• maps3d (google.maps.Maps3DLibrary)
• places (google.maps.PlacesLibrary)
• geocoding (google.maps.GeocodingLibrary)
• routes (google.maps.RoutesLibrary)
• marker (google.maps.MarkerLibrary)
• geometry (google.maps.GeometryLibrary)
• elevation (google.maps.ElevationLibrary)
• streetView (google.maps.StreetViewLibrary)
• journeySharing (google.maps.JourneySharingLibrary)
• visualization (google.maps.VisualizationLibrary)
• airQuality (google.maps.AirQualityLibrary)
• addressValidation (google.maps.AddressValidationLibrary)
• drawing (google.maps.DrawingLibrary) (deprecated) block

The following bootstrap request illustrates how to add a request for the google.maps.geometry library of the Maps JavaScript API, to the direct script loading tag:

<script async
    src="https://maps.googleapis.com/maps/api/js?key=YOUR_API_KEY&loading=async&libraries=geometry&callback=initMap">
</script>

To request multiple libraries, separate them with a comma:

<script async
    src="https://maps.googleapis.com/maps/api/js?key=YOUR_API_KEY&loading=async&libraries=geometry,places&callback=initMap">
</script>