> For the complete documentation index, see [llms.txt](https://docs.mapbox.com/mapbox-gl-js/ja/llms.txt)
# Use a fallback image
Use a [`coalesce`](https://docs.mapbox.com/style-spec/reference/expressions/#coalesce) expression to display another image when a requested image is not available.
This example uses a GeoJSON source with features that include an `icon` property. In this case, one feature has an `icon` property that does not match the name of any image in the [Mapbox Light](https://www.mapbox.com/maps/light) style's [sprite](https://docs.mapbox.com/help/glossary/sprite/). For that feature, the map will display a fallback image of a rocket.
> Example code:
**JavaScript**
```html
Use a fallback image
```
**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/light-v11',
center: [-77, 38.75],
zoom: 5
});
mapRef.current.on('load', () => {
mapRef.current.addSource('points', {
type: 'geojson',
data: {
type: 'FeatureCollection',
features: [
{
type: 'Feature',
geometry: {
type: 'Point',
coordinates: [-77.03238901390978, 38.913188059745586]
},
properties: {
title: 'Washington DC',
icon: 'monument'
}
},
{
type: 'Feature',
geometry: {
type: 'Point',
coordinates: [-79.9959, 40.4406]
},
properties: {
title: 'Pittsburgh',
icon: 'bridges'
}
},
{
type: 'Feature',
geometry: {
type: 'Point',
coordinates: [-76.2859, 36.8508]
},
properties: {
title: 'Norfolk',
icon: 'harbor'
}
}
]
}
});
mapRef.current.addLayer({
id: 'points',
type: 'symbol',
source: 'points',
layout: {
'icon-image': [
'coalesce',
['image', ['get', 'icon']],
['image', 'rocket']
],
'text-field': ['get', 'title'],
'text-font': ['Open Sans Semibold', 'Arial Unicode MS Bold'],
'text-offset': [0, 0.6],
'text-anchor': 'top'
}
});
});
}, []);
return ;
};
export default MapboxExample;
```