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I am trying to connect the sessions of express API and socket.IO server. But it seems both are storing their sessions separately. The socket.IO have the connections session while the express server has the user qid session. I am using express ^4.17.1 and socket.IO ^4.1.2. Here is my code:
/server.js
const express = require("express");
const session = require("express-session");
const sharedSession = require("express-socket.io-session");
const cookieParser = require("cookie-parser");
const app = express();
app.use(cookieParser("secret"));
const corsConfig = {
origin: function (origin, callback) {
if (!origin || whitelist.indexOf(origin) !== -1) {
callback(null, true);
} else {
callback(new Error("Not allowed by CORS"));
}
},
credentials: true,
};
const server = require("http").createServer(app);
const io = require("socket.io")(server, { cors: corsConfig });
const whitelist = ["http://localhost:3000", "http://192.168.2.104:3000"];
const sessionMiddleware = session({
secret: "keyboard cat",
cookie: { maxAge: 60000 },
name: "qid",
});
// register middleware in Express
app.use(sessionMiddleware);
// register middleware in Socket.IO
io.use((socket, next) => {
sessionMiddleware(socket.request, {}, next);
// sessionMiddleware(socket.request, socket.request.res, next); will not work with websocket-only
// connections, as 'socket.request.res' will be undefined in that case
});
// TRIED, BUT SAME RESULT. . .
// io.use(sharedSession(sessionMiddleware, { autoSave: true }));
app.get("/", (req, res) => {
req.session.qid = "sdfdsfsadgfas";
req.session.save();
console.log(
"CONNECTIONS / QID (EXPRESS SERVER)",
req.session.connections,
req.session.qid
);
res.json({ success: true });
});
io.on("connection", (socket) => {
const session = socket.request.session;
// console.log(socket.request);
if (!session.connections) session.connections = 0;
session.connections++;
session.save();
socket.on("a", () => {
session.reload((err) => {
if (err) console.log("ERROR", err);
console.log(
"CONNECTIONS / QID (IO SERVER)",
session.connections,
session.qid
);
});
});
});
const port = process.env.PORT || 5000;
server.listen(port, () => console.log("server listening on port " + port));
/client.html
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<meta http-equiv="X-UA-Compatible" content="IE=edge" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<title>Test</title>
</head>
<body></body>
<script
src="https://cdn.socket.io/3.1.3/socket.io.min.js"
integrity="sha384-cPwlPLvBTa3sKAgddT6krw0cJat7egBga3DJepJyrLl4Q9/5WLra3rrnMcyTyOnh"
crossorigin="anonymous"
></script>
<script>
const socket = io("http://localhost:5000");
fetch("http://localhost:5000/").then(() => socket.emit("a"));
</script>
</html>
Please help me with this. Thanks in advance.
851
asked Oct 17 '25 02:10
You can pass the encrypted session id in the front while connecting, and decrypt it in backend...
Front
const socket = io("http://localhost:5000?session=sessionIdEncrypted");
Backend
io.on("connection", socket => {
const givenSessionId = socket.handshake.query.session
// here you decrypt the session id and find it in the store
})
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