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class Error:

Standard API error envelope. Every error response wraps a single error object with a machine-readable code, a human-readable message, and optional structured details.

required Error Error

Error payload

required string Code

Machine-readable error code (e.g. invalid_request, not_found, rate_limited, query_error, daily_limit_exceeded)

required string Message

Human-readable explanation of what went wrong

IReadOnlyDictionary<string, JsonElement>? Details

Structured details when available (e.g. field-level validation errors, rate limit metadata, billing info)

class FeatureCollection:

GeoJSON FeatureCollection (RFC 7946). For paginated endpoints, metadata is returned in HTTP response headers rather than the body:

Header Description
X-Limit Requested result limit
X-Has-More true if more results exist
X-Next-Cursor Opaque cursor for next page (cursor pagination)
X-Next-Offset Numeric offset for next page (offset pagination)
Link RFC 8288 rel="next" link to the next page

Content-Type is application/geo+json.

required IReadOnlyList<GeoJsonFeature> Features

Array of GeoJSON Feature objects

required GeoJsonGeometry Geometry

GeoJSON Geometry object per RFC 7946. Coordinates use [longitude, latitude] order. 3D coordinates [lng, lat, elevation] are used for elevation endpoints.

required Coordinates Coordinates

Coordinates array. Nesting depth varies by geometry type: Point = [lng, lat], LineString = [[lng, lat], ...], Polygon = [[[lng, lat], ...], ...], etc.

One of the following:
IReadOnlyList<Double>
IReadOnlyList<IReadOnlyList<Double>>
IReadOnlyList<IReadOnlyList<IReadOnlyList<Double>>>
IReadOnlyList<IReadOnlyList<IReadOnlyList<IReadOnlyList<Double>>>>
required Type Type

Geometry type

One of the following:
"Point"Point
"LineString"LineString
"Polygon"Polygon
"MultiPoint"MultiPoint
"MultiLineString"MultiLineString
"MultiPolygon"MultiPolygon
required IReadOnlyDictionary<string, JsonElement> Properties

OSM tags flattened as key-value pairs, plus @type (node/way/relation) and @id (OSM ID) metadata fields. May include distance_m for proximity queries.

required Type Type

Always Feature

string ID

Compound identifier in type/osm_id format

required Type Type

Always FeatureCollection

class GeoJsonFeature:

GeoJSON Feature representing an OSM element. Tags from the original OSM element are flattened directly into properties (not nested under a tags key). Metadata fields @type and @id identify the OSM element type and ID within properties.

required GeoJsonGeometry Geometry

GeoJSON Geometry object per RFC 7946. Coordinates use [longitude, latitude] order. 3D coordinates [lng, lat, elevation] are used for elevation endpoints.

required Coordinates Coordinates

Coordinates array. Nesting depth varies by geometry type: Point = [lng, lat], LineString = [[lng, lat], ...], Polygon = [[[lng, lat], ...], ...], etc.

One of the following:
IReadOnlyList<Double>
IReadOnlyList<IReadOnlyList<Double>>
IReadOnlyList<IReadOnlyList<IReadOnlyList<Double>>>
IReadOnlyList<IReadOnlyList<IReadOnlyList<IReadOnlyList<Double>>>>
required Type Type

Geometry type

One of the following:
"Point"Point
"LineString"LineString
"Polygon"Polygon
"MultiPoint"MultiPoint
"MultiLineString"MultiLineString
"MultiPolygon"MultiPolygon
required IReadOnlyDictionary<string, JsonElement> Properties

OSM tags flattened as key-value pairs, plus @type (node/way/relation) and @id (OSM ID) metadata fields. May include distance_m for proximity queries.

required Type Type

Always Feature

string ID

Compound identifier in type/osm_id format

class GeoJsonGeometry:

GeoJSON Geometry object per RFC 7946. Coordinates use [longitude, latitude] order. 3D coordinates [lng, lat, elevation] are used for elevation endpoints.

required Coordinates Coordinates

Coordinates array. Nesting depth varies by geometry type: Point = [lng, lat], LineString = [[lng, lat], ...], Polygon = [[[lng, lat], ...], ...], etc.

One of the following:
IReadOnlyList<Double>
IReadOnlyList<IReadOnlyList<Double>>
IReadOnlyList<IReadOnlyList<IReadOnlyList<Double>>>
IReadOnlyList<IReadOnlyList<IReadOnlyList<IReadOnlyList<Double>>>>
required Type Type

Geometry type

One of the following:
"Point"Point
"LineString"LineString
"Polygon"Polygon
"MultiPoint"MultiPoint
"MultiLineString"MultiLineString
"MultiPolygon"MultiPolygon