diff --git a/backend/lib/edgehog/devices/devices.ex b/backend/lib/edgehog/devices/devices.ex
index 7266374df..4b3fcd4eb 100644
--- a/backend/lib/edgehog/devices/devices.ex
+++ b/backend/lib/edgehog/devices/devices.ex
@@ -29,6 +29,7 @@ defmodule Edgehog.Devices do
     ]
 
   graphql do
+    root_level_errors? true
   end
 
   resources do
diff --git a/backend/lib/edgehog/tenants/tenants.ex b/backend/lib/edgehog/tenants/tenants.ex
index ccdf4a5d9..a9a832919 100644
--- a/backend/lib/edgehog/tenants/tenants.ex
+++ b/backend/lib/edgehog/tenants/tenants.ex
@@ -23,6 +23,7 @@ defmodule Edgehog.Tenants do
     extensions: [AshGraphql.Api, AshJsonApi.Api]
 
   graphql do
+    root_level_errors? true
   end
 
   json_api do
diff --git a/backend/test/edgehog_web/schema/mutation/create_hardware_type_test.exs b/backend/test/edgehog_web/schema/mutation/create_hardware_type_test.exs
index d896e129e..ced35f4e8 100644
--- a/backend/test/edgehog_web/schema/mutation/create_hardware_type_test.exs
+++ b/backend/test/edgehog_web/schema/mutation/create_hardware_type_test.exs
@@ -59,7 +59,7 @@ defmodule EdgehogWeb.Schema.Mutation.CreateHardwareTypeTest do
           handle: "123Invalid$"
         )
 
-      assert %{"fields" => ["handle"], "message" => "should only contain" <> _} =
+      assert %{fields: [:handle], message: "should only contain" <> _} =
                extract_error!(result)
     end
 
@@ -70,7 +70,7 @@ defmodule EdgehogWeb.Schema.Mutation.CreateHardwareTypeTest do
           part_numbers: []
         )
 
-      assert %{"fields" => ["part_numbers"], "message" => "must have 1 or more items"} =
+      assert %{fields: [:part_numbers], message: "must have 1 or more items"} =
                extract_error!(result)
     end
 
@@ -83,7 +83,7 @@ defmodule EdgehogWeb.Schema.Mutation.CreateHardwareTypeTest do
           name: fixture.name
         )
 
-      assert %{"fields" => ["name"], "message" => "has already been taken"} =
+      assert %{fields: [:name], message: "has already been taken"} =
                extract_error!(result)
     end
 
@@ -96,7 +96,7 @@ defmodule EdgehogWeb.Schema.Mutation.CreateHardwareTypeTest do
           handle: fixture.handle
         )
 
-      assert %{"fields" => ["handle"], "message" => "has already been taken"} =
+      assert %{fields: [:handle], message: "has already been taken"} =
                extract_error!(result)
     end
 
@@ -132,13 +132,6 @@ defmodule EdgehogWeb.Schema.Mutation.CreateHardwareTypeTest do
             partNumber
           }
         }
-        errors {
-          code
-          fields
-          message
-          shortMessage
-          vars
-        }
       }
     }
     """
@@ -160,12 +153,8 @@ defmodule EdgehogWeb.Schema.Mutation.CreateHardwareTypeTest do
 
   defp extract_error!(result) do
     assert %{
-             data: %{
-               "createHardwareType" => %{
-                 "result" => nil,
-                 "errors" => [error]
-               }
-             }
+             data: nil,
+             errors: [error]
            } = result
 
     error
@@ -178,8 +167,7 @@ defmodule EdgehogWeb.Schema.Mutation.CreateHardwareTypeTest do
     assert %{
              data: %{
                "createHardwareType" => %{
-                 "result" => hardware_type,
-                 "errors" => []
+                 "result" => hardware_type
                }
              }
            } = result
diff --git a/backend/test/edgehog_web/schema/mutation/delete_hardware_type_test.exs b/backend/test/edgehog_web/schema/mutation/delete_hardware_type_test.exs
index b13920e52..5122d2763 100644
--- a/backend/test/edgehog_web/schema/mutation/delete_hardware_type_test.exs
+++ b/backend/test/edgehog_web/schema/mutation/delete_hardware_type_test.exs
@@ -42,7 +42,7 @@ defmodule EdgehogWeb.Schema.Mutation.DeleteHardwareTypeTest do
     test "fails with non-existing id", %{tenant: tenant} do
       result = delete_hardware_type_mutation(tenant: tenant, id: 123_789)
 
-      assert %{"fields" => ["id"], "message" => "could not be found"} = extract_error!(result)
+      assert %{fields: [:id], message: "could not be found"} = extract_error!(result)
     end
   end
 
@@ -53,13 +53,6 @@ defmodule EdgehogWeb.Schema.Mutation.DeleteHardwareTypeTest do
         result {
           id
         }
-        errors {
-          code
-          fields
-          message
-          shortMessage
-          vars
-        }
       }
     }
     """
@@ -76,12 +69,8 @@ defmodule EdgehogWeb.Schema.Mutation.DeleteHardwareTypeTest do
 
   defp extract_error!(result) do
     assert %{
-             data: %{
-               "deleteHardwareType" => %{
-                 "result" => nil,
-                 "errors" => [error]
-               }
-             }
+             data: nil,
+             errors: [error]
            } = result
 
     error
@@ -94,8 +83,7 @@ defmodule EdgehogWeb.Schema.Mutation.DeleteHardwareTypeTest do
     assert %{
              data: %{
                "deleteHardwareType" => %{
-                 "result" => hardware_type,
-                 "errors" => []
+                 "result" => hardware_type
                }
              }
            } = result
diff --git a/backend/test/edgehog_web/schema/mutation/update_hardware_type_test.exs b/backend/test/edgehog_web/schema/mutation/update_hardware_type_test.exs
index 92de0f30e..4c31b1f9f 100644
--- a/backend/test/edgehog_web/schema/mutation/update_hardware_type_test.exs
+++ b/backend/test/edgehog_web/schema/mutation/update_hardware_type_test.exs
@@ -110,7 +110,7 @@ defmodule EdgehogWeb.Schema.Mutation.UpdateHardwareTypeTest do
           handle: "123Invalid$"
         )
 
-      assert %{"fields" => ["handle"], "message" => "should only contain" <> _} =
+      assert %{fields: [:handle], message: "should only contain" <> _} =
                extract_error!(result)
     end
 
@@ -122,7 +122,7 @@ defmodule EdgehogWeb.Schema.Mutation.UpdateHardwareTypeTest do
           part_numbers: []
         )
 
-      assert %{"fields" => ["part_numbers"], "message" => "must have 1 or more items"} =
+      assert %{fields: [:part_numbers], message: "must have 1 or more items"} =
                extract_error!(result)
     end
 
@@ -136,7 +136,7 @@ defmodule EdgehogWeb.Schema.Mutation.UpdateHardwareTypeTest do
           name: fixture.name
         )
 
-      assert %{"fields" => ["name"], "message" => "has already been taken"} =
+      assert %{fields: [:name], message: "has already been taken"} =
                extract_error!(result)
     end
 
@@ -150,7 +150,7 @@ defmodule EdgehogWeb.Schema.Mutation.UpdateHardwareTypeTest do
           handle: fixture.handle
         )
 
-      assert %{"fields" => ["handle"], "message" => "has already been taken"} =
+      assert %{fields: [:handle], message: "has already been taken"} =
                extract_error!(result)
     end
 
@@ -190,13 +190,6 @@ defmodule EdgehogWeb.Schema.Mutation.UpdateHardwareTypeTest do
             partNumber
           }
         }
-        errors {
-          code
-          fields
-          message
-          shortMessage
-          vars
-        }
       }
     }
     """
@@ -222,12 +215,8 @@ defmodule EdgehogWeb.Schema.Mutation.UpdateHardwareTypeTest do
 
   defp extract_error!(result) do
     assert %{
-             data: %{
-               "updateHardwareType" => %{
-                 "result" => nil,
-                 "errors" => [error]
-               }
-             }
+             data: nil,
+             errors: [error]
            } = result
 
     error
@@ -240,8 +229,7 @@ defmodule EdgehogWeb.Schema.Mutation.UpdateHardwareTypeTest do
     assert %{
              data: %{
                "updateHardwareType" => %{
-                 "result" => hardware_type,
-                 "errors" => []
+                 "result" => hardware_type
                }
              }
            } = result