How to check session in Node.js Express?

Question

I try to check if session in Express 4 is exist:

if(req.session.user == undefined) {}

It gives me error:

 Cannot read property          


        

Answer 1

The issue you are facing is maybe you are not using the session middleware in ALL of your requests. You can check it the following way :

1. Add this to all of your routes :

app.use(session({ secret: 'keyboard cat',resave:false,saveUninitialized:false, cookie: { maxAge: 60000 }}));

2. Authentication Route :

router.post('/', function(req, res, next) {
  //login logic here

  //if login successfull
  req.session.user = username //your unique identifier
  req.send("Hurray! logged in");

  //else
  req.send("Credentials error");

});

3. Check in any route:

router.get('/dashboard', function(req, res, next) {
  if (req.session.user)
    //do stuff here
  else
  //redirect to login page

})

This works :)