diff --git a/app/controllers/api/transformation_mappings_controller.rb b/app/controllers/api/transformation_mappings_controller.rb
index 7dae753e74..6fa8a3c00e 100644
--- a/app/controllers/api/transformation_mappings_controller.rb
+++ b/app/controllers/api/transformation_mappings_controller.rb
@@ -10,6 +10,13 @@ def create_resource(_type, _id, data = {})
       raise BadRequestError, "Could not create Transformation Mapping - #{err}"
     end
 
+    def validate_vms_resource(type, id, data = {})
+      transformation_mapping = resource_search(id, type, collection_class(type))
+      transformation_mapping.validate_vms(data["import"]) || {}
+    rescue StandardError => err
+      raise BadRequestError, "Could not validate vms - #{err}"
+    end
+
     private
 
     def create_mapping_items(items)
diff --git a/config/api.yml b/config/api.yml
index faa9a68ed2..fc43359905 100644
--- a/config/api.yml
+++ b/config/api.yml
@@ -3101,6 +3101,9 @@
       :get:
       - :name: read
         :identifier: transformation_mapping_show
+      :post:
+      - :name: validate_vms
+        :identifier: transformation_mapping_new
   :users:
     :description: Users
     :identifier: rbac_user
diff --git a/spec/requests/transformation_mappings_spec.rb b/spec/requests/transformation_mappings_spec.rb
index dc1791ba36..2200837aa9 100644
--- a/spec/requests/transformation_mappings_spec.rb
+++ b/spec/requests/transformation_mappings_spec.rb
@@ -142,5 +142,50 @@
         expect(response).to have_http_status(:forbidden)
       end
     end
+
+    context "POST /api/transformation_mappings/:id" do
+      context "with an appropriate role" do
+        it "can validate vms with csv data specified" do
+          api_basic_authorize(action_identifier(:transformation_mappings, :validate_vms, :resource_actions, :post))
+          ems_cluster = FactoryGirl.create(:ems_cluster)
+          vm = FactoryGirl.create(:vm_openstack, :name => "foo", :ems_cluster => ems_cluster)
+
+          request = {
+            "action" => "validate_vms",
+            "import" => [
+              {"name" => vm.name, "uid" => vm.uid_ems},
+              {"name" => "bad name", "uid" => "bad uid"}
+            ]
+          }
+          post(api_transformation_mapping_url(nil, transformation_mapping), :params => request)
+
+          expected = {
+            "valid_vms"    => [a_hash_including("name" => "foo")],
+            "invalid_vms"  => [a_hash_including("name" => "bad name")],
+            "conflict_vms" => []
+          }
+          expect(response).to have_http_status(:ok)
+          expect(response.parsed_body).to include(expected)
+        end
+
+        it "can validate vms without csv data" do
+          api_basic_authorize(action_identifier(:transformation_mappings, :validate_vms, :resource_actions, :post))
+
+          post(api_transformation_mapping_url(nil, transformation_mapping), :params => {"action" => "validate_vms"})
+
+          expect(response).to have_http_status(:ok)
+        end
+      end
+    end
+
+    context "without an appropriate role" do
+      it "cannot validate vms" do
+        api_basic_authorize
+
+        post(api_transformation_mapping_url(nil, transformation_mapping), :params => {"action" => "validate_vms"})
+
+        expect(response).to have_http_status(:forbidden)
+      end
+    end
   end
 end