"req.session.user = user" where user is not defined - node.js

Question

I had read almost every possible threads, post, questions, I got on setting session cookies, still didn't get the perfect solution.
I had created a web application where I want to set sessions cookies who had logged in.
Not able to figure out why the "user" is undefined. Where did I lack? I had did every trail and error to figure out the error.
App.js file
const session = require('client-sessions');
app.use(cookieParser());
app.use(session({
cookieName: 'sessioncookie',
secret: 'long_string_which_is_hard_to_crack',
duration: 30 * 60 * 1000,
activeDuration: 5 * 60 * 1000,
}));
Routes.js file
router.post('/login', (req, res) => {
const emaild = req.body.email;
const passd = req.body.pass;
db.collection('check').findOne({email: emaild}, (err, result) => {
if (err) return console.log(err);
console.log(result.passcode);
console.log('Retrived from database');
bcrypt.compare(passd, result.passcode, function(err, boolean) {
console.log(boolean);
if(boolean == true) {
req.session.user = user; //// It's Undefined
res.redirect('/dashboard');
} else {
res.send('<h1>Wrong Password</h1>');
}
});
});
});

Answer 1

When you query your collection with findOne method it will return you the related document ( here user which you name it result ) and you should name it with a meaningful parameter like user and then user becames available within this callback function.
Also when you get the following error on req.session.user = user;:
Cannot set property 'user' of undefined
It means that req.session is undefined. Using express, setting session on request is doing by session middlewares. here you are using client-sessions which attachs session by cookieName option value you pass it at initialization. so you should set it like the following:
req.sessioncookie.user = user;
Note that middleware ordering does matters. you should configure you application using middlewares before setting up your routes. this way every incoming request is populated with desired configuration you have been set up.