msgspec-geojson

A collection of GeoJSON types for msgspec.

Inspired by the msgspec GeoJSON example code and geojson-pydantic.

This lets you parse GeoJSON into type-safe objects, including propeties, and serialize those objects back to GeoJSON:

>>> import msgspec.json
>>> from msgspec import Struct
>>> from msgspec_geojson import Feature, Point

>>> class PoiProperties(Struct):
...    name: str
...    kind: str

>>> type PoiFeature = Feature[Point, PoiProperties]

>>> obj = msgspec.json.decode("""
...     {"type": "Feature", "id": 1,
...      "properties": {"name": "Zoo Zürich", "kind": "tourism/zoo"},
...      "geometry": {"type": "Point", "coordinates": [8.574695, 47.384510]}}
... """, type=PoiFeature)

>>> obj.id
1
>>> obj.geometry
Point(coordinates=(8.574695, 47.38451))
>>> obj.properties
PoiProperties(name='Zoo Zürich', kind='tourism/zoo')

>>> feature = Feature(
...     Point(coordinates=(7.5823576, 47.5489249)),
...     PoiProperties(name="Zoo Basel", kind="tourism/zoo"),
... )
>>> msgspec.json.encode(feature)
b'{"type":"Feature","geometry":{"type":"Point","coordinates":[7.5823576,47.5489249]},"properties":{"name":"Zoo Basel","kind":"tourism/zoo"}}'