Update app.py

app.py

@@ -533,7 +533,7 @@ def validate_output_against_model(fields, text):
         return False, err, None
     try:
         instance = model.model_validate(data)
-        normalized = json.dumps(instance.model_dump(), ensure_ascii=False, indent=2)
+        normalized = json.dumps(instance.model_dump(mode="json"), ensure_ascii=False, indent=2)
         return True, "OK", normalized
     except Exception as e:
         try: