User logout can happen in controller.

api/controllers/userController.js

@@ -43,7 +43,13 @@ const login = (req, res, next) => {
     });
 };
 
+const logout = (req, res) => {
+  req.logout();
+  res.redirect("/");
+};
+
 module.exports = {
   register,
-  login
+  login,
+  logout
 };

api/user.js

@@ -83,14 +83,8 @@ const login = (req, user) => {
   });
 };
 
-const logout = (req, res) => {
-  req.logout();
-  res.redirect("/");
-};
-
 module.exports = {
   register,
   authenticate,
-  login,
-  logout
+  login
 };