diff --git a/lib/web/auth/interface.ts b/lib/web/auth/interface.ts
new file mode 100644
index 000000000..d6a7fade5
--- /dev/null
+++ b/lib/web/auth/interface.ts
@@ -0,0 +1,5 @@
+import { Router } from 'express'
+
+export interface AuthMiddleware {
+  getMiddleware (): Router;
+}