> For the complete documentation index, see [llms.txt](https://docs.mapbox.com/mapbox-gl-js/ja/llms.txt)
# Load data from an external GeoJSON file
This example adds [GeoJSON](https://docs.mapbox.com/help/glossary/geojson/) data from an external file and uses it in a layer on the map.
Upon loading the map, it uses [`addSource`](https://docs.mapbox.com/mapbox-gl-js/ja/api/map/#map#addsource) to add the [`GeoJSONSource`](https://docs.mapbox.com/mapbox-gl-js/ja/api/sources/#geojsonsource) to the map, using a URL string as the value for `data`. Then it uses [`addLayer`](https://docs.mapbox.com/mapbox-gl-js/ja/api/map/#map#addlayer) to create a `circle` layer that references the source.
> Example code:
**JavaScript**
```html
Load data from an external GeoJSON file
```
**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-satellite',
zoom: 2,
center: [108, 4]
});
mapRef.current.on('style.load', () => {
mapRef.current.setFog({});
});
mapRef.current.on('load', () => {
mapRef.current.addSource('earthquakes', {
type: 'geojson',
data: 'https://docs.mapbox.com/mapbox-gl-js/assets/earthquakes.geojson'
});
mapRef.current.addLayer({
id: 'earthquakes-layer',
type: 'circle',
source: 'earthquakes',
paint: {
'circle-radius': 4,
'circle-stroke-width': 2,
'circle-color': 'red',
'circle-stroke-color': 'white'
}
});
});
return () => mapRef.current.remove();
}, []);
return ;
};
export default MapboxExample;
```