An example applying middleware pre validation.

middelwareExample.js

// post management after get
exports.get("/my/admin/url",
function(request, response, next){
   if(request.session.user){
      next();
   }else{
      response.status(403).redirect("/login");
   }
}, 
function(request, response){
   response.render("myAdminPage",{});
});