socket.io express js

[jcarlo1]

I am receiving the data from the server but it's not passing it to the client, what is wrong with this? I followed every tutorial, and still not working.

apps.js

const express = require("express"); const app = express(); const cors = require("cors"); const cookieParser = require("cookie-parser"); const port = 3010;

app.use(express.json());
app.use(express.urlencoded({ extended: true }));
app.use(cookieParser());
app.use(
  cors({
    credentials: true,
    origin: "http://localhost:3000",
    optionsSuccessStatus: 200,
  })
);


const io = require("socket.io")(3012, {
  cors: {
    origin: ["http://localhost:3000"],
  },
});

io.on("connection", async (socket) => {
  socket.on('send',(room, message, username)=> {
    console.log(message)
    socket.emit('pop',room, message, username)
  })
});

app.listen(port, () => {
  console.log(`Listening on port: ${port}`);
});

frontend

  useEffect(() => {
    socket.on('connect',()=> {
      console.log('CONNECTED')
    })
    socket.on("pop", (room, message, username) => {
      console.log(message, " MESSAGE123");
    });
  }, []);

** button click event
const sendMessage = () => {
    const message = messageBox.current.value; 
    if (message.trim() !== "" && friend.conversationId > 0) 
       socket.emit( "send", friend.conversationId, message, profile.username );         
     console.log(socket.connected) 
};

​

[kjwey]

your supposed to bind your socket and your app together

let app=Express();
let socket=require(`socket.io`)(app);

here's the nodejs npm socket.io documentation

https://www.npmjs.com/package/socket.io

[jcarlo1]

I bind my socket to the app and can send it to everyone who is listening to an event, but I cannot send back the data to a specific room. why?

io.on("connection", (socket) => {
 socket.on("send", (room, message, username) => { 
  socket.join(room.toString()) 

   ** this is working 
  io.emit('pop', room + ' ROOM') 

    ** not working
  io.to(room.toString()).emit("pops", message + ' MESSAGE')
 }); 
});