Sanitize numpy bools before JSON dump

app.py

@@ -44,6 +44,26 @@ def _safe_json_schema_to_python_type(schema, defs=None):
 grc_utils.get_type = _safe_get_type
 grc_utils.json_schema_to_python_type = _safe_json_schema_to_python_type
 
+# ---------------------------------------------------------------------------
+# JSON sanitation helper (convert numpy types & PIL-friendly outputs)
+# ---------------------------------------------------------------------------
+def to_jsonable(obj):
+    if isinstance(obj, dict):
+        return {k: to_jsonable(v) for k, v in obj.items()}
+    if isinstance(obj, (list, tuple)):
+        return [to_jsonable(v) for v in obj]
+    if isinstance(obj, (np.bool_, bool)):
+        return bool(obj)
+    if isinstance(obj, (np.integer,)):
+        return int(obj)
+    if isinstance(obj, (np.floating,)):
+        return float(obj)
+    if isinstance(obj, np.ndarray):
+        return obj.tolist()
+    if isinstance(obj, Image.Image):
+        return None  # avoid serializing images; skip in JSON
+    return obj
+
 # ============================================================================
 # Configuration
 # ============================================================================
@@ -657,7 +677,7 @@ def process_receipt(image):
     {fields_html}
     """
     
-    return summary_html, ocr_image, ocr_text, json.dumps(results, indent=2)
+    return summary_html, ocr_image, ocr_text, json.dumps(to_jsonable(results), indent=2)
 
 
 # ============================================================================