diff --git a/src/formatters/json_formatter.py b/src/formatters/json_formatter.py
index a7d7ce4..524fa43 100644
--- a/src/formatters/json_formatter.py
+++ b/src/formatters/json_formatter.py
@@ -11,5 +11,8 @@ class JSONFormatter(BaseFormatter):
     def format(data: Any) -> str:
         """Format data as JSON."""
         if hasattr(data, "to_dict"):
-            data = data.to_dict()
-        return json.dumps(data, indent=2, default=str)
+            return json.dumps(data.to_dict(), indent=2, default=str)
+        elif hasattr(data, "__dict__"):
+            return json.dumps(data.__dict__, indent=2, default=str)
+        else:
+            return json.dumps(data, indent=2, default=str)