Redirect back to previous page when visiting login and sign up pages after user is already logged in

config/passport.js

@@ -160,7 +160,9 @@ passport.use(new GoogleStrategy({
 
 // Simple route middleware to ensure user is authenticated.  Otherwise send to login page.
 exports.ensureAuthenticated = function ensureAuthenticated(req, res, next) {
-  if (req.isAuthenticated()) { return next(); }
+  if (req.isAuthenticated()) {
+    return next();
+  }
   res.redirect('/login');
 };