Estoy tratando de crear una sala cuando una publicación solicita /room/create , pero aparece este error: TypeError: Cannot read property 'join' of undefined . Creé un middleware que me permite usar el objeto io en una solicitud, pero aparentemente todavía no funciona.

server.js:

 const express = require("express"); const app = express(); const { createServer } = require("http"); const { Server } = require("socket.io"); const port = process.env.PORT || 5000; const httpServer = createServer(app) const roomRouter = require("./routers/roomRouter") const io = new Server(httpServer, { cors:{ origin: "http://localhost:3000", methods: ["GET", "POST"] } }) io.on("connection", (socket) => { console.log(socket.id); }) app.use((req, res, next) => { req.io = io next() }) httpServer.listen(port, () => { console.log(`Listening on port ${port}`); }) app.use("/room", roomRouter) app.use((req, res) => { res.status(404).send("URL not found!"); });

roomRouter.js:

 const express = require("express") const router = express.Router() router.post("/create", async(req, res, next) => { try { // This line causes the error: req.io.socket.join("room1") const id = 27432 res.status(201).json({id: id}) } catch (err) { console.log(err); res.status(500).json({error: err}) } }) module.exports = router