вот как вы делаете сеансы
// how you setup session
var MemoryStore = require('express').session.MemoryStore;
app.use(express.cookieParser());
app.use(express.session({ secret: "keyboard cat", store: new MemoryStore({ reapInterval: 60000 * 10 })}));
//to store sessions
app.post('/',function(req,res){
req.session.user = "myname";
});