diff --git a/backend/auto_labeling/exceptions.py b/backend/auto_labeling/exceptions.py
index 8b94890b..a6368e4c 100644
--- a/backend/auto_labeling/exceptions.py
+++ b/backend/auto_labeling/exceptions.py
@@ -24,3 +24,7 @@ class SampleDataException(ValidationError):
 
 class TemplateMappingError(ValidationError):
     default_detail = "The response cannot be mapped. You might need to change the template."
+
+
+class ResponseJSONDecodeError(ValidationError):
+    default_detail = "The response cannot be decoded." "Please try to return the response in dictionary or list format."
diff --git a/backend/auto_labeling/views.py b/backend/auto_labeling/views.py
index aa092611..43dfad92 100644
--- a/backend/auto_labeling/views.py
+++ b/backend/auto_labeling/views.py
@@ -17,6 +17,7 @@ from rest_framework.views import APIView
 
 from .exceptions import (
     AWSTokenError,
+    ResponseJSONDecodeError,
     SampleDataException,
     TemplateMappingError,
     URLConnectionError,
@@ -94,6 +95,8 @@ class RestAPIRequestTesting(APIView):
             raise URLConnectionError
         except botocore.exceptions.ClientError:
             raise AWSTokenError()
+        except json.decoder.JSONDecodeError:
+            raise ResponseJSONDecodeError()
         except Exception as e:
             raise e