convert Numpy.Array/Generic for JSON encoding (#1008)

Author: vincentsarago

CHANGES.md

@@ -22,6 +22,7 @@
 
 * Use `@attrs.define` instead of dataclass for factories **breaking change**
 * Use `@attrs.define` instead of dataclass for factory extensions **breaking change**
+* Handle `numpy` types in JSON/GeoJSON response
 
 ### titiler.core
 

src/titiler/core/titiler/core/resources/responses.py

@@ -2,6 +2,7 @@
 
 from typing import Any
 
+import numpy
 import simplejson as json
 from starlette import responses
 
@@ -12,6 +13,16 @@ class XMLResponse(responses.Response):
     media_type = "application/xml"
 
 
+class NumpyEncoder(json.JSONEncoder):
+    """Custom JSON Encoder."""
+
+    def default(self, obj):
+        """Catch numpy types and convert them."""
+        if isinstance(obj, (numpy.ndarray, numpy.generic)):
+            return obj.tolist()
+        return super().default(obj)
+
+
 class JSONResponse(responses.JSONResponse):
     """Custom JSON Response."""
 
@@ -27,6 +38,7 @@ def render(self, content: Any) -> bytes:
             indent=None,
             ignore_nan=True,
             separators=(",", ":"),
+            cls=NumpyEncoder,
         ).encode("utf-8")