> For the complete documentation index, see [llms.txt](https://docs.mapbox.com/mapbox-gl-js/llms.txt)
# Add a pattern to a polygon
This example uses an image from an external URL as a repeating pattern that fills a polygon feature on the map.
It uses [`loadImage()`](https://docs.mapbox.com/mapbox-gl-js/api/map/#map#loadimage) to load the image from an external URL, then adds the loaded image to the style with [`addImage()`](https://docs.mapbox.com/mapbox-gl-js/api/map/#map#addimage). Then it uses [`addLayer()`](https://docs.mapbox.com/mapbox-gl-js/api/map/#map#addlayer) to create a new [symbol layer](https://docs.mapbox.com/style-spec/reference/layers/#symbol) that uses [`fill-pattern`](https://docs.mapbox.com/style-spec/reference/layers/#paint-fill-fill-pattern) to fill a polygon with a pattern created by the repeating image.
> **Note (warning): Supported File Types**
>
> Only `.png`, `.jpg` and `.webp` formats are supported when loading images into a style at runtime using [`map.loadImage()`](https://docs.mapbox.com/mapbox-gl-js/api/map/#map#loadimage). Other file types like `.svg` are not supported.
> Example code:
**JavaScript**
```html
Add a pattern to a polygon
```
**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',
center: [-105.819711, 39.147614],
zoom: 5
});
mapRef.current.on('load', () => {
mapRef.current.addSource('source', {
type: 'geojson',
data: {
type: 'Feature',
properties: {},
geometry: {
type: 'Polygon',
coordinates: [
[
[-108.977199, 40.975108],
[-102.105019, 40.995138],
[-102.078486, 37.017605],
[-109.083333, 37.017605],
[-108.977199, 40.975108]
]
]
}
}
});
mapRef.current.loadImage(
'https://docs.mapbox.com/mapbox-gl-js/assets/colorado_flag.png',
(err, image) => {
if (err) throw err;
mapRef.current.addImage('pattern', image);
mapRef.current.addLayer({
id: 'pattern-layer',
type: 'fill',
source: 'source',
paint: {
'fill-pattern': 'pattern'
}
});
}
);
});
}, []);
return ;
};
export default MapboxExample;
```