How to get cookie on new connection on server nodejs

Question

I'm currently using node js and express to build a webapp.

I want to check when a user changes the page to check if he has a special cookie.

For this i tried :

server.on('request', (req, res)=>{`
    console.log(req)
    console.log(req.cookies)
    console.log("\nCookie in serverCreate:\n")
    console.log(req.cookies)
    console.log("\nEnd Cookie in serverCreate:\n")
    if(req.cookies["user"] == undefined || req.cookies["user"]==null || req.cookies["user"]==""){
       res.redirect("/")
    }
})

And I get this error:

TypeError: Cannot read property 'user' of undefined

And when I console.log(req), i get an big dictionary but with out cookies.

Thanks