Encode an sf object as GeoJSON for a JSON response, NULL-safe

Returns an unboxed GeoJSON string for an sf object, or NULL if the input is NULL or not an sf object (so an absent layer serializes as JSON null, not [] or an error).

Usage

aurora_geojson(x)

Arguments

x

An sf object, or NULL.

Value

An unboxed GeoJSON string, or NULL.