diff --git a/internal/types/middleware.go b/internal/types/middleware.go
new file mode 100644
index 0000000..14c15bf
--- /dev/null
+++ b/internal/types/middleware.go
@@ -0,0 +1,6 @@
+package types
+
+type contextKey string
+
+const UserIdKey contextKey = "userID"
+