> For the complete documentation index, see [llms.txt](https://docs.mapbox.com/mapbox-gl-js/llms.txt)
# Attach a popup to a marker instance
Attach a [`Popup`](https://docs.mapbox.com/mapbox-gl-js/api/markers/#popup) to a [Marker](https://docs.mapbox.com/mapbox-gl-js/api/markers/#marker) and display it on click.
> Example code:
**JavaScript**
```html
Attach a popup to a marker instance
```
**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();
const markerRef = useRef();
useEffect(() => {
const monument = [-77.0353, 38.8895];
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'
}
},
center: monument,
zoom: 15
});
const popup = new mapboxgl.Popup({ offset: 25 }).setText(
'Construction on the Washington Monument began in 1848.'
);
new mapboxgl.Marker(markerRef.current)
.setLngLat(monument)
.setPopup(popup)
.addTo(mapRef.current);
return () => mapRef.current.remove();
}, []);
return (
<>
);
};
export default MapboxExample;
```
> **Related content (tutorial): [Custom Markers](null)**
>
> If you would like to customize your markers with images or other HTML functionality, see our Custom Markers video tutorial.