Authentication (Node.js Express-session), I can't figure out how it works, can you help?

Question

MySQL

I'm using express-socket.io-session on top to be able to consume data over socket.
Here are the docks: https://www.npmjs.com/package/express-socket.io-session
I'm including them below.

var session = require("express-session")({

    secret: 'boss',

    resave: true,

    saveUninitialized: true,

      cookie: {
        maxAge: 25200000
      }
});

var sharedsession = require("express-socket.io-session");

Here, as far as I understand, I activate them:

app.use(session);

 

// Use shared session middleware for socket.io

// setting autoSave:true

io.use(sharedsession(session, {

    autoSave:true

})); 

The data is entered (sess.connect commented out because I don’t know if it works, and it didn’t help):

sess = socket.handshake.session;
      //sess.connect;
      sess.uid = socket.id;

Explain to me, fool, how it works in simple terms and how to use it for authentication, how to open and close a session, whether session data is deleted after it is closed, etc.