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This example demonstrates path encoding using the Geometry library. Click the map to create a polyline. The encoding of this polyline then appears in the text box.
Read the documentation.
TypeScript// This example requires the Geometry library. Include the libraries=geometry
// parameter when you first load the API. For example:
// <script src="https://maps.googleapis.com/maps/api/js?key=YOUR_API_KEY&libraries=geometry">
function initMap(): void {
const map = new google.maps.Map(
document.getElementById("map") as HTMLElement,
{
zoom: 14,
center: { lat: 34.366, lng: -89.519 },
}
);
const poly = new google.maps.Polyline({
strokeColor: "#000000",
strokeOpacity: 1,
strokeWeight: 3,
map: map,
});
// Add a listener for the click event
google.maps.event.addListener(map, "click", (event) => {
addLatLngToPoly(event.latLng, poly);
});
}
/**
* Handles click events on a map, and adds a new point to the Polyline.
* Updates the encoding text area with the path's encoded values.
*/
function addLatLngToPoly(
latLng: google.maps.LatLng,
poly: google.maps.Polyline
) {
const path = poly.getPath();
// Because path is an MVCArray, we can simply append a new coordinate
// and it will automatically appear
path.push(latLng);
// Update the text field to display the polyline encodings
const encodeString = google.maps.geometry.encoding.encodePath(path);
if (encodeString) {
(document.getElementById("encoded-polyline") as HTMLInputElement).value =
encodeString;
}
}
declare global {
interface Window {
initMap: () => void;
}
}
window.initMap = initMap;Note: Read the guide on using TypeScript and Google Maps. JavaScript
// This example requires the Geometry library. Include the libraries=geometry
// parameter when you first load the API. For example:
// <script src="https://maps.googleapis.com/maps/api/js?key=YOUR_API_KEY&libraries=geometry">
function initMap() {
const map = new google.maps.Map(document.getElementById("map"), {
zoom: 14,
center: { lat: 34.366, lng: -89.519 },
});
const poly = new google.maps.Polyline({
strokeColor: "#000000",
strokeOpacity: 1,
strokeWeight: 3,
map: map,
});
// Add a listener for the click event
google.maps.event.addListener(map, "click", (event) => {
addLatLngToPoly(event.latLng, poly);
});
}
/**
* Handles click events on a map, and adds a new point to the Polyline.
* Updates the encoding text area with the path's encoded values.
*/
function addLatLngToPoly(latLng, poly) {
const path = poly.getPath();
// Because path is an MVCArray, we can simply append a new coordinate
// and it will automatically appear
path.push(latLng);
// Update the text field to display the polyline encodings
const encodeString = google.maps.geometry.encoding.encodePath(path);
if (encodeString) {
document.getElementById("encoded-polyline").value = encodeString;
}
}
window.initMap = initMap;Note: The JavaScript is compiled from the TypeScript snippet. CSS
/* Optional: Makes the sample page fill the window. */
html,
body {
height: 100%;
margin: 0;
padding: 0;
}
#container {
height: 100%;
display: flex;
}
#sidebar {
flex-basis: 15rem;
flex-grow: 1;
padding: 1rem;
max-width: 30rem;
height: 100%;
box-sizing: border-box;
overflow: auto;
}
#map {
flex-basis: 0;
flex-grow: 4;
height: 100%;
}
#encoded-polyline {
height: 100px;
width: 100%;
}
HTML
<html>
<head>
<title>Encoding Methods</title>
<link rel="stylesheet" type="text/css" href="./style.css" />
<script type="module" src="./index.js"></script>
</head>
<body>
<div id="container">
<div id="map"></div>
<div id="sidebar">
<div>Encoding:</div>
<textarea id="encoded-polyline"></textarea>
</div>
</div>
<!--
The `defer` attribute causes the script to execute after the full HTML
document has been parsed. For non-blocking uses, avoiding race conditions,
and consistent behavior across browsers, consider loading using Promises. See
https://developers.google.com/maps/documentation/javascript/load-maps-js-api
for more information.
-->
<script
src="https://maps.googleapis.com/maps/api/js?key=AIzaSyB41DRUbKWJHPxaFjMAwdrzWzbVKartNGg&callback=initMap&libraries=geometry&v=weekly"
defer
></script>
</body>
</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 -b sample-geometry-encodings https://github.com/googlemaps/js-samples.gitcd js-samplesnpm inpm start
Other samples can be tried by switching to any branch beginning with sample-SAMPLE_NAME.
git checkout sample-SAMPLE_NAMEnpm inpm start
Except as otherwise noted, the content of this page is licensed under the Creative Commons Attribution 4.0 License, and code samples are licensed under the Apache 2.0 License. For details, see the Google Developers Site Policies. Java is a registered trademark of Oracle and/or its affiliates.
Last updated 2025-08-14 UTC.
[[["Easy to understand","easyToUnderstand","thumb-up"],["Solved my problem","solvedMyProblem","thumb-up"],["Other","otherUp","thumb-up"]],[["Missing the information I need","missingTheInformationINeed","thumb-down"],["Too complicated / too many steps","tooComplicatedTooManySteps","thumb-down"],["Out of date","outOfDate","thumb-down"],["Samples / code issue","samplesCodeIssue","thumb-down"],["Other","otherDown","thumb-down"]],["Last updated 2025-08-14 UTC."],[[["This example shows how to encode a polyline path using the Google Maps Geometry library."],["Users can click on the map to create a polyline, and the encoded path will be displayed."],["The encoded path is a compact representation of the polyline's coordinates."],["Code samples are provided in TypeScript and JavaScript, alongside CSS and HTML for a complete implementation."]]],["This code demonstrates encoding a polyline path on a Google Map. A map is initialized, and a polyline is drawn. When the user clicks the map, a new point is added to the polyline's path. The path is then encoded using `google.maps.geometry.encoding.encodePath()`. The encoded string of this polyline is then displayed in a text box for the user. The application is made by using Html, Css, Typscript, Javascript and the Google Maps Geometry library.\n"]]
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