> For the complete documentation index, see [llms.txt](https://docs.mapbox.com/mapbox-gl-js/llms.txt)
# Add a WMS source
Add an external [Web Map Service raster layer](https://www.ogc.org/standards/wms) to the map using [`addSource`](https://docs.mapbox.com/mapbox-gl-js/api/map/#map#addsource)'s [`tiles`](https://docs.mapbox.com/style-spec/reference/sources/#raster-tiles) option.
> Example code:
**JavaScript**
```html
Add a WMS source
```
**React**
```jsx
import React, { useEffect, useRef } from 'react';
import * as mapboxgl from 'mapbox-gl/esm';
import 'mapbox-gl/dist/mapbox-gl.css';
const MapboxExample = () => {
const mapContainerRef = useRef();
const mapRef = useRef();
useEffect(() => {
mapRef.current = new mapboxgl.Map({
// TO MAKE THE MAP APPEAR YOU MUST
// ADD YOUR ACCESS TOKEN FROM
// https://account.mapbox.com
accessToken: 'YOUR_MAPBOX_ACCESS_TOKEN',
container: mapContainerRef.current,
style: 'mapbox://styles/mapbox/standard',
config: {
basemap: {
theme: 'monochrome'
}
},
zoom: 8,
center: [-74.5447, 40.6892]
});
mapRef.current.on('load', () => {
mapRef.current.addSource('wms-test-source', {
type: 'raster',
tiles: [
'https://img.nj.gov/imagerywms/Natural2015?bbox={bbox-epsg-3857}&format=image/png&service=WMS&version=1.1.1&request=GetMap&srs=EPSG:3857&transparent=true&width=256&height=256&layers=Natural2015'
],
tileSize: 256
});
mapRef.current.addLayer({
id: 'wms-test-layer',
type: 'raster',
source: 'wms-test-source',
paint: {},
slot: 'middle'
});
});
return () => mapRef.current.remove();
}, []);
return ;
};
export default MapboxExample;
```