# Source

![Since v5.1](https://img.shields.io/badge/since-v5.1-green)

This component allows apps to create a [map source](https://docs.mapbox.com/mapbox-gl-js/style-spec/#sources) using React. It may contain [Layer](/docs/api-reference/layer.md) components as children.

```js
import * as React from 'react';
import ReactMapGL, {Source, Layer} from 'react-map-gl';

const geojson = {
  type: 'FeatureCollection',
  features: [
    {type: 'Feature', geometry: {type: 'Point', coordinates: [-122.4, 37.8]}}
  ]
};

const layerStyle = {
  id: 'point',
  type: 'circle',
  paint: {
    'circle-radius': 10,
    'circle-color': '#007cbf'
  }
};

function App() {
  const [viewport, setViewport] = React.useState({
    longitude: -122.45,
    latitude: 37.78,
    zoom: 14
  });
  return (
    <ReactMapGL {...viewport} width="100vw" height="100vh" onViewportChange={setViewport}>
      <Source id="my-data" type="geojson" data={geojson}>
        <Layer {...layerStyle} />
      </Source>
    </ReactMapGL>
  );
}
```

## Properties

The props provided to this component should be conforming to the [Mapbox source specification](https://docs.mapbox.com/mapbox-gl-js/style-spec/#sources)or [CanvasSourceOptions](https://docs.mapbox.com/mapbox-gl-js/api/#canvassourceoptions).

Note that the map component's [mapStyle](/docs/api-reference/static-map.md#mapstyle) prop defaults to `mapbox://styles/mapbox/light-v8`. To use an empty base map with your own sources, you need to override the prop, e.g.:

```js
const EMPTY_STYLE = {
  version: 8,
  sources: {},
  layers: []
};

<ReactMapGL ... mapStyle={EMPTY_STYLE}>
```

When props change _shallowly_, the component will attempt to update the source. Do not define objects/arrays inline to avoid perf hit.

Once a `<Source>` is mounted, the following props should not change. If add/remove multiple JSX sources dynamically, make sure you use React's [key prop](https://reactjs.org/docs/lists-and-keys.html#keys) to give each element a stable identity.

##### `id` (String)

Unique identifier of the source. If not provided, a default id will be assigned.

##### `type` (String, required)

Type of the source.

## Source

[source.js](https://github.com/visgl/react-map-gl/tree/6.1-release/src/components/source.js)
