diff --git a/src/geneweaver/api/controller/utilities.py b/src/geneweaver/api/controller/utilities.py
new file mode 100644
index 0000000..2481026
--- /dev/null
+++ b/src/geneweaver/api/controller/utilities.py
@@ -0,0 +1,36 @@
+"""Utilities for FastAPI Controller."""
+
+from fastapi import HTTPException
+
+from . import message as api_message
+
+EXCEPTION_MAP = {
+    api_message.ACCESS_FORBIDDEN: HTTPException(
+        status_code=403, detail=api_message.ACCESS_FORBIDDEN
+    ),
+    api_message.INACCESSIBLE_OR_FORBIDDEN: HTTPException(
+        status_code=404, detail=api_message.INACCESSIBLE_OR_FORBIDDEN
+    ),
+    api_message.RECORD_NOT_FOUND_ERROR: HTTPException(
+        status_code=404, detail=api_message.RECORD_NOT_FOUND_ERROR
+    ),
+    api_message.RECORD_EXISTS: HTTPException(
+        status_code=412, detail=api_message.RECORD_EXISTS
+    ),
+}
+
+
+def raise_http_error(response: dict) -> None:
+    """Raise HTTPException based on response message.
+
+    :param response: dict
+
+    raises: HTTPException if "error" key is in response dict.
+    """
+    if "error" in response:
+        try:
+            raise EXCEPTION_MAP[response.get("message")]
+        except KeyError:
+            raise HTTPException(
+                status_code=500, detail=api_message.UNEXPECTED_ERROR
+            ) from None