Reverse Geocoding

This example demonstrates reverse geocoding of coordinates to addresses.

Read the documentation.

TypeScript

let marker;

async function initMap() {
    //  Request the needed libraries.
    const [{ Map, InfoWindow }, { Geocoder }, { AdvancedMarkerElement }] =
        await Promise.all([
            google.maps.importLibrary(
                'maps'
            ) as Promise<google.maps.MapsLibrary>,
            google.maps.importLibrary(
                'geocoding'
            ) as Promise<google.maps.GeocodingLibrary>,
            google.maps.importLibrary(
                'marker'
            ) as Promise<google.maps.MarkerLibrary>,
        ]);

    // Get the gmp-map element.
    const mapElement = document.querySelector(
        'gmp-map'
    ) as google.maps.MapElement;

    // Get the inner map.
    const innerMap = mapElement.innerMap;

    // Get the latlng input box.
    const latLngQuery = document.getElementById('latlng') as HTMLInputElement;

    // Get the submit button.
    const submitButton = document.getElementById('submit') as HTMLElement;

    // Set the cursor to crosshair.
    innerMap.setOptions({
        draggableCursor: 'crosshair',
        zoom: 13,
    });

    // Create a marker for re-use.
    marker = new AdvancedMarkerElement({
        map: innerMap,
    });

    const geocoder = new Geocoder();
    const infowindow = new InfoWindow();

    // Add a click event listener to the submit button.
    submitButton.addEventListener('click', () => {
        geocodeLatLng(geocoder, innerMap, infowindow);
    });

    // Add a click event listener to the map.
    innerMap.addListener('click', (event) => {
        latLngQuery.value = `${event.latLng.lat()}, ${event.latLng.lng()}`;
        geocodeLatLng(geocoder, innerMap, infowindow);
    });

    // Make an initial request upon loading.
    geocodeLatLng(geocoder, innerMap, infowindow);
}

async function geocodeLatLng(
    geocoder: google.maps.Geocoder,
    map: google.maps.Map,
    infowindow: google.maps.InfoWindow
) {
    const input = (document.getElementById('latlng') as HTMLInputElement).value;
    const latlngStr = input.split(',', 2);
    const latlng = {
        lat: parseFloat(latlngStr[0]),
        lng: parseFloat(latlngStr[1]),
    };

    geocoder
        .geocode({ location: latlng })
        .then((response) => {
            if (response.results[0]) {
                marker.position = latlng;
                map.setCenter(latlng);
                infowindow.setContent(response.results[0].formatted_address);
                infowindow.open(map, marker);
            } else {
                window.alert('No results found');
            }
        })
        .catch((e) => window.alert('Geocoder failed due to: ' + e));
}

initMap();
index.ts

JavaScript

let marker;
async function initMap() {
    //  Request the needed libraries.
    const [{ Map, InfoWindow }, { Geocoder }, { AdvancedMarkerElement }] = await Promise.all([
        google.maps.importLibrary('maps'),
        google.maps.importLibrary('geocoding'),
        google.maps.importLibrary('marker'),
    ]);
    // Get the gmp-map element.
    const mapElement = document.querySelector('gmp-map');
    // Get the inner map.
    const innerMap = mapElement.innerMap;
    // Get the latlng input box.
    const latLngQuery = document.getElementById('latlng');
    // Get the submit button.
    const submitButton = document.getElementById('submit');
    // Set the cursor to crosshair.
    innerMap.setOptions({
        draggableCursor: 'crosshair',
        zoom: 13,
    });
    // Create a marker for re-use.
    marker = new AdvancedMarkerElement({
        map: innerMap,
    });
    const geocoder = new Geocoder();
    const infowindow = new InfoWindow();
    // Add a click event listener to the submit button.
    submitButton.addEventListener('click', () => {
        geocodeLatLng(geocoder, innerMap, infowindow);
    });
    // Add a click event listener to the map.
    innerMap.addListener('click', (event) => {
        latLngQuery.value = `${event.latLng.lat()}, ${event.latLng.lng()}`;
        geocodeLatLng(geocoder, innerMap, infowindow);
    });
    // Make an initial request upon loading.
    geocodeLatLng(geocoder, innerMap, infowindow);
}
async function geocodeLatLng(geocoder, map, infowindow) {
    const input = document.getElementById('latlng').value;
    const latlngStr = input.split(',', 2);
    const latlng = {
        lat: parseFloat(latlngStr[0]),
        lng: parseFloat(latlngStr[1]),
    };
    geocoder
        .geocode({ location: latlng })
        .then((response) => {
        if (response.results[0]) {
            marker.position = latlng;
            map.setCenter(latlng);
            infowindow.setContent(response.results[0].formatted_address);
            infowindow.open(map, marker);
        }
        else {
            window.alert('No results found');
        }
    })
        .catch((e) => window.alert('Geocoder failed due to: ' + e));
}
initMap();
index.js

CSS

/*
* Always set the map height explicitly to define the size of the div element
* that contains the map.
*/
gmp-map {
    height: 100%;
}

/*
* Optional: Makes the sample page fill the window.
*/
html,
body {
    height: 100%;
    margin: 0;
    padding: 0;
    font-family: Roboto, sans-serif;
}

#floating-panel {
    background-color: #fff;
    border-radius: 5px;
    box-shadow: rgba(0, 0, 0, 0.35) 0px 5px 15px;
    margin: 10px;
    padding: 15px;
    font-family: Roboto, sans-serif;
    font-size: 1rem;
}

#latlng {
    width: 100%;
    font-family: Roboto, sans-serif;
    font-size: 1rem;
    margin-bottom: 4px;
}

#submit {
    font-size: 1rem;
}
style.css

HTML

<html>
    <head>
        <title>Reverse Geocoding</title>

        <link rel="stylesheet" type="text/css" href="./style.css" />
        <script type="module" src="./index.js"></script>
        <!-- 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: "AIzaSyA6myHzS10YXdcazAFalmXvDkrYCp5cLc8", v: "weekly"});</script>
    </head>
    <body>
        <gmp-map center="0.714224, -73.961452" zoom="8" map-id="DEMO_MAP_ID">
            <div id="floating-panel" slot="control-block-start-inline-center">
                <p>
                    Click the map to reverse geocode, or paste in your own
                    coordinates.
                </p>
                <input
                    id="latlng"
                    type="text"
                    value="40.714224, -73.961452" /><br />
                <input id="submit" type="button" value="Reverse Geocode" />
            </div>
        </gmp-map>
    </body>
</html>
index.html

Try Sample

Clone Sample

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

  git clone https://github.com/googlemaps-samples/js-api-samples.git
  cd samples/geocoding-reverse
  npm i
  npm start