Is there a way to set up a global web socket in NextJs?

I recently completed a tutorial on setting up a socket chat app, which I found at the following link: tutorial link. While I have successfully managed to get the system up and running, I'm facing an issue with exporting the front-end socket from the index.jsx to other parts of my application. Every time I run the initializer in other functions, it creates a new socket instance, leading to complications. If there was a way to make the socket variable in /pages/index.tsx a global variable, it would resolve all my current issues.

Let me share a snippet of my /pages/index.tsx code for reference:

import { useEffect } from "react";
import io from "socket.io-client";

let socket: any; //I need help exporting this to different parts of my app

const Home = () => {
    useEffect(() => {
        socketInitializer();
    }, []);

    const socketInitializer = async () => {
        // Initiating socket connection
        await fetch("/api/socket");

        socket = io();
        console.log('index initialized socket.id: ', socket.id)
    };
}

export default Home;

While inserting the socket initializer into various sections of my application seems to work, each socket instance has a unique ID. Consequently, assigning a room to one user is exclusive to that particular socket, making it inaccessible to others.

Answer №1

In my experience, when working with Next.js and sockets, it is important to call the socketInitializer function in the _app.js file, which serves as the top-level component. This ensures that your websocket code runs regardless of which page a user lands on. For example, if a user receives a direct link to a specific page within your app and does not visit the home page, they would miss out on using the socket service.

To address this issue, you should create a singleton socket object and utilize closure to access it within functions that can be exported. I have provided guidance on setting up the socket functionality here: UseEffect hook with socket.io state is not persistent in socket handlers

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