Utilizing socket.io to access the session object in an express application

While utilizing socket.io with express and incorporating express session along with express-socket.io-session, I am encountering difficulty in accessing the properties of the express session within the socket.io session object, and vice versa.

const server = require("http").createServer(app);
const client = require("socket.io").listen(server);

session = require("express-session")({
    secret: "my-secret",
    resave: true,
    saveUninitialized: true
  }),
  sharedsession = require("express-socket.io-session");

app.use(session);
client.use(sharedsession(session, {
    autoSave:true
})); 

client.on("connection", (socket) => {

    socket.on("input", data => {
        console.log(socket.handshake.session.user)
        socket.handshake.session.name = "bar"
        socket.handshake.session.save()
    })

})


app.post("/signup", (req, res, next) => {
    req.session.user = "foo";
})


app.get("/test", (req, res, next) => {
    console.log(req.session.name)
})

When using both console.log(), undefined is returned, indicating that they are indeed separate objects.

Answer №1

My problem was successfully fixed, however I am confused by a strange occurrence when utilizing

var socket = io('http://localhost:8080')
in the client HTML sock.io session ID differs from express session ID; yet when using var socket = io(), both IDs are the same and everything functions properly as anticipated.

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