How to use socket.io in multiple routes in node js

Question

I want to send real time notifications in my MERN app. And I am using socket.io for it. The thing I am confused with is that where should I initialize my socket.io if I want to use it on multiple routes. And how do I use it.

Every time a certain event happens I want to notify the user through a post route and there are multiple post routes like that. So my question is where should I initialize my socket.io for multiple usage and how should I use it. Please give me the code for it and make it clear for me.

Currently I am initializing my socket.io after connection of my server with my Database like this

mongoose
  .connect(process.env.MongoDb_Url)
  .then(() => {
    const io = socket(
      app.listen(5000, () => console.log("Server And Database Are Running")),
      {
        cors: {
          origin: "http://localhost:3000",
        },
      }
    );
    io.on("connection", (socket) => {
      socket.on("message", async (message) => {
        const messageCreated = await chatModel.create({ ...message });
        socket.emit("createdMessage", messageCreated);
      });
    });
  })
  .catch((error) => console.log(error.message));

Now what should I do ?

Answer 1

I actually achieved it through the app.set() method in my app.js file

app.set("io",io)

and then you can just access that in the request object of your route.

console.log(req.app.settings.io)