diff --git a/railties/lib/rails/generators/test_unit/scaffold/templates/api_functional_test.rb b/railties/lib/rails/generators/test_unit/scaffold/templates/api_functional_test.rb
index 0d18478043879d0ec997f1a04c60c98d7d8f1b11..c469c188e68790fb7f26a40e8c4356084a0987aa 100644
--- a/railties/lib/rails/generators/test_unit/scaffold/templates/api_functional_test.rb
+++ b/railties/lib/rails/generators/test_unit/scaffold/templates/api_functional_test.rb
@@ -11,31 +11,31 @@ class <%= controller_class_name %>ControllerTest < ActionDispatch::IntegrationTe
   end
 
   test "should get index" do
-    get <%= index_helper %>_url
+    get <%= index_helper %>_url, as: :json
     assert_response :success
   end
 
   test "should create <%= singular_table_name %>" do
     assert_difference('<%= class_name %>.count') do
-      post <%= index_helper %>_url, params: { <%= "#{singular_table_name}: { #{attributes_hash} }" %> }
+      post <%= index_helper %>_url, params: { <%= "#{singular_table_name}: { #{attributes_hash} }" %> }, as: :json
     end
 
     assert_response 201
   end
 
   test "should show <%= singular_table_name %>" do
-    get <%= show_helper %>
+    get <%= show_helper %>, as: :json
     assert_response :success
   end
 
   test "should update <%= singular_table_name %>" do
-    patch <%= show_helper %>, params: { <%= "#{singular_table_name}: { #{attributes_hash} }" %> }
+    patch <%= show_helper %>, params: { <%= "#{singular_table_name}: { #{attributes_hash} }" %> }, as: :json
     assert_response 200
   end
 
   test "should destroy <%= singular_table_name %>" do
     assert_difference('<%= class_name %>.count', -1) do
-      delete <%= show_helper %>
+      delete <%= show_helper %>, as: :json
     end
 
     assert_response 204
diff --git a/railties/test/generators/scaffold_controller_generator_test.rb b/railties/test/generators/scaffold_controller_generator_test.rb
index c37e289f4b0ee83f4775490b61b1a1e8776a667c..736ff0b41f4a8cda9ffb26f4e0450f4640cde179 100644
--- a/railties/test/generators/scaffold_controller_generator_test.rb
+++ b/railties/test/generators/scaffold_controller_generator_test.rb
@@ -238,8 +238,8 @@ def test_api_controller_tests
     assert_file "test/controllers/users_controller_test.rb" do |content|
       assert_match(/class UsersControllerTest < ActionDispatch::IntegrationTest/, content)
       assert_match(/test "should get index"/, content)
-      assert_match(/post users_url, params: \{ user: \{ age: @user\.age, name: @user\.name, organization_id: @user\.organization_id, organization_type: @user\.organization_type \} \}/, content)
-      assert_match(/patch user_url\(@user\), params: \{ user: \{ age: @user\.age, name: @user\.name, organization_id: @user\.organization_id, organization_type: @user\.organization_type \} \}/, content)
+      assert_match(/post users_url, params: \{ user: \{ age: @user\.age, name: @user\.name, organization_id: @user\.organization_id, organization_type: @user\.organization_type \} \}, as: :json/, content)
+      assert_match(/patch user_url\(@user\), params: \{ user: \{ age: @user\.age, name: @user\.name, organization_id: @user\.organization_id, organization_type: @user\.organization_type \} \}, as: :json/, content)
       assert_no_match(/assert_redirected_to/, content)
     end
   end