toGeoJSON

Converts the geometry to a GeoJSON Feature object or a GeoJSON FeatureCollection object.

This function has 2 overloads, when called with:

• a single geometry object it returns a GeoJSON Feature object,
• an array of geometry objects it returns a GeoJSON FeatureCollection object.

Converting multiple geometries into a single FeatureCollection is faster than converting each geometry into Feature individually because it processes the data in bulk.

Type Parameters

• P - The type of geometry/feature properties

Parameters

Name	Type	Description
geometryies	Geometry<P> | Geometry<P>[]	The geometry object or the array of geometry objects to be converted into a GeoJSON object

Returns

GeoJSON_Feature<GeoJSON_Geometry, P> | GeoJSON_FeatureCollection<GeoJSON_Geometry, P>

GeoJSON Feature or GeoJSON FeatureCollection object

Throws

• GEOSError when called with an unsupported geometry type (not GeoJSON)

See also

• GeometryRef#toJSON converts geometry to a GeoJSON Feature object

Examples

const a = point([ 0, 0 ]);
const feature = toGeoJSON(a); // or `a.toJSON();`
// { type: 'Feature', geometry: {...}, properties: null }

const b = point([ 1, 0 ]);
const featureCollection = toGeoJSON([ a, b ]);
// { type: 'FeatureCollection', features: [ {...}, {...} ] }

const a = point([ 0, 0 ]); const feature = toGeoJSON(a); // or `a.toJSON();` // { type: 'Feature', geometry: {...}, properties: null } const b = point([ 1, 0 ]); const featureCollection = toGeoJSON([ a, b ]); // { type: 'FeatureCollection', features: [ {...}, {...} ] }