Add markers to a web map with a symbol layer | Mapbox GL JS

This example draws points from a GeoJSON collection to a map.
Upon loading, the map uses loadImage to add an image to the application, addSource to add a collection of points to the application, and then addLayer to draw the image on the map at each point location.
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>Add markers to a web map with a symbol layer</title>
<meta name="viewport" content="initial-scale=1,maximum-scale=1,user-scalable=no">
<link href="https://api.mapbox.com/mapbox-gl-js/v3.3.0/mapbox-gl.css" rel="stylesheet">
<script src="https://api.mapbox.com/mapbox-gl-js/v3.3.0/mapbox-gl.js"></script>
<style>
body { margin: 0; padding: 0; }
#map { position: absolute; top: 0; bottom: 0; width: 100%; }
</style>
</head>
<body>
<div id="map"></div>
<script>
	// TO MAKE THE MAP APPEAR YOU MUST
	// ADD YOUR ACCESS TOKEN FROM
	// https://account.mapbox.com
	mapboxgl.accessToken = 'YOUR_MAPBOX_ACCESS_TOKEN';
    const map = new mapboxgl.Map({
        container: 'map',
        // Choose from Mapbox's core styles, or make your own style with Mapbox Studio
        style: 'mapbox://styles/mapbox/streets-v12',
        center: [-96, 37.8],
        zoom: 3
    });

    map.on('load', () => {
        // Add an image to use as a custom marker
        map.loadImage(
            'https://docs.mapbox.com/mapbox-gl-js/assets/custom_marker.png',
            (error, image) => {
                if (error) throw error;
                map.addImage('custom-marker', image);
                // Add a GeoJSON source with 2 points
                map.addSource('points', {
                    'type': 'geojson',
                    'data': {
                        'type': 'FeatureCollection',
                        'features': [
                            {
                                // feature for Mapbox DC
                                'type': 'Feature',
                                'geometry': {
                                    'type': 'Point',
                                    'coordinates': [
                                        -77.03238901390978, 38.913188059745586
                                    ]
                                },
                                'properties': {
                                    'title': 'Mapbox DC'
                                }
                            },
                            {
                                // feature for Mapbox SF
                                'type': 'Feature',
                                'geometry': {
                                    'type': 'Point',
                                    'coordinates': [-122.414, 37.776]
                                },
                                'properties': {
                                    'title': 'Mapbox SF'
                                }
                            }
                        ]
                    }
                });

                // Add a symbol layer
                map.addLayer({
                    'id': 'points',
                    'type': 'symbol',
                    'source': 'points',
                    'layout': {
                        'icon-image': 'custom-marker',
                        // get the title name from the source's "title" property
                        'text-field': ['get', 'title'],
                        'text-font': [
                            'Open Sans Semibold',
                            'Arial Unicode MS Bold'
                        ],
                        'text-offset': [0, 1.25],
                        'text-anchor': 'top'
                    }
                });
            }
        );
    });
</script>

</body>
</html>
Was this example helpful?