Add a new layer below labels | Mapbox GL JS

This example uses the second argument of addLayer to add a new layer in a precise place in the stack, below the symbol layer that contains labels.

The new fill layer uses an external geojson source to add polygon features that are styled with a pink (#f08) fill-color.

<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>Add a new layer below labels</title>
<meta name="viewport" content="initial-scale=1,maximum-scale=1,user-scalable=no">
<link href="https://api.mapbox.com/mapbox-gl-js/v3.0.0/mapbox-gl.css" rel="stylesheet">
<script src="https://api.mapbox.com/mapbox-gl-js/v3.0.0/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: [-88.137343, 35.137451],
zoom: 3,
maxZoom: 6
});
 
map.on('load', () => {
const layers = map.getStyle().layers;
// Find the index of the first symbol layer in the map style.
let firstSymbolId;
for (const layer of layers) {
if (layer.type === 'symbol') {
firstSymbolId = layer.id;
break;
}
}
 
map.addSource('urban-areas', {
'type': 'geojson',
'data': 'https://docs.mapbox.com/mapbox-gl-js/assets/ne_50m_urban_areas.geojson'
});
map.addLayer(
{
'id': 'urban-areas-fill',
'type': 'fill',
'source': 'urban-areas',
'layout': {},
'paint': {
'fill-color': '#f08',
'fill-opacity': 0.4
}
// This is the important part of this example: the addLayer
// method takes 2 arguments: the layer as an object, and a string
// representing another layer's name. If the other layer
// exists in the style already, the new layer will be positioned
// right before that layer in the stack, making it possible to put
// 'overlays' anywhere in the layer stack.
// Insert the layer beneath the first symbol layer.
},
firstSymbolId
);
});
</script>
 
</body>
</html>

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