You're all set!

To start developing, please head over to our developer documentation.

Activate the Google Maps JavaScript API

To get you started we'll guide you through the Google Developers Console to do a few things first:

  1. Create or choose a project
  2. Activate the Google Maps JavaScript API and related services
  3. Create appropriate keys
Continue

Simple Polylines

Read the documentation or view this example full screen.

// This example creates a 2-pixel-wide red polyline showing the path of William
// Kingsford Smith's first trans-Pacific flight between Oakland, CA, and
// Brisbane, Australia.

function initMap() {
  var map = new google.maps.Map(document.getElementById('map'), {
    zoom: 3,
    center: {lat: 0, lng: -180},
    mapTypeId: google.maps.MapTypeId.TERRAIN
  });

  var flightPlanCoordinates = [
    {lat: 37.772, lng: -122.214},
    {lat: 21.291, lng: -157.821},
    {lat: -18.142, lng: 178.431},
    {lat: -27.467, lng: 153.027}
  ];
  var flightPath = new google.maps.Polyline({
    path: flightPlanCoordinates,
    geodesic: true,
    strokeColor: '#FF0000',
    strokeOpacity: 1.0,
    strokeWeight: 2
  });

  flightPath.setMap(map);
}
<div id="map"></div>
html, body {
  height: 100%;
  margin: 0;
  padding: 0;
}
#map {
  height: 100%;
}
<!-- Replace the value of the key parameter with your own API key. -->
<script async defer
src="https://maps.googleapis.com/maps/api/js?key=AIzaSyCkUOdZ5y7hMm0yrcCQoCvLwzdM6M8s5qk&callback=initMap">
</script>

Try it yourself

Hover at top right of the code block to copy the code or open it in JSFiddle.

<!DOCTYPE html>
<html>
  <head>
    <meta name="viewport" content="initial-scale=1.0, user-scalable=no">
    <meta charset="utf-8">
    <title>Simple Polylines</title>
    <style>
      html, body {
        height: 100%;
        margin: 0;
        padding: 0;
      }
      #map {
        height: 100%;
      }
    </style>
  </head>
  <body>
    <div id="map"></div>
    <script>

      // This example creates a 2-pixel-wide red polyline showing the path of William
      // Kingsford Smith's first trans-Pacific flight between Oakland, CA, and
      // Brisbane, Australia.

      function initMap() {
        var map = new google.maps.Map(document.getElementById('map'), {
          zoom: 3,
          center: {lat: 0, lng: -180},
          mapTypeId: google.maps.MapTypeId.TERRAIN
        });

        var flightPlanCoordinates = [
          {lat: 37.772, lng: -122.214},
          {lat: 21.291, lng: -157.821},
          {lat: -18.142, lng: 178.431},
          {lat: -27.467, lng: 153.027}
        ];
        var flightPath = new google.maps.Polyline({
          path: flightPlanCoordinates,
          geodesic: true,
          strokeColor: '#FF0000',
          strokeOpacity: 1.0,
          strokeWeight: 2
        });

        flightPath.setMap(map);
      }
    </script>
    <script async defer
    src="https://maps.googleapis.com/maps/api/js?key=YOUR_API_KEY&callback=initMap">
    </script>
  </body>
</html>

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Google Maps JavaScript API
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