How to separate Socket.IO events from server.js? - node.js

Question

I created Express, Node, React app.
Now, i want to integrate socket.io to the app.
I searched all over the internet and i found that all the socket.io events are in the initial server.js/app.js file.
But, i want to separate the socket.io events from the main file and then import it to the main file, just like routes/controllers files.
My code right now:
var app = require("express")();
var http = require("http").createServer(app);
var io = require("socket.io")(http);
const mongoose = require("mongoose");
const stocks = require("./routes/stockRoutes");
const bodyParser = require("body-parser");
const cors = require("cors");
const port = 5000;
app.use(stocks);
app.use(bodyParser.urlencoded({ extended: true }));
app.use(cors());
app.set("socketio", io);
const uri =
"mongodb+srv://admin:admin1234#investockcluster0.jp2wh.mongodb.net/<stocks_data>?retryWrites=true&w=majority";
mongoose.connect(uri, {
useNewUrlParser: true,
useCreateIndex: true,
useUnifiedTopology: true,
});
const connection = mongoose.connection;
connection.once("open", () => {
console.log("MongoDB database connection established successfully");
});
io.on("connection", (socket) => {
socket.emit("hello", "world");
console.log("New Connection");
});
http.listen(port, () => {
console.log(`Server is running on port: ${port}`);
});
I want that this code will be in file like "socketEvents.js" and then require it.
io.on("connection", (socket) => {
socket.emit("hello", "world");
console.log("New Connection");
});
Thanks a lot :)

Answer 1

Just put your socket.io code in another module and pass in the server in an initialization method:
// in sock.js
module.exports = function(server) {
const io = require("socket.io")(server);
io.on("connection", (socket) => {
socket.emit("hello", "world");
console.log("New Connection");
});
// put other things that use io here
}
Then, in your main file:
require('./sock.js')(http);
FYI, http is a crummy variable name for your server. You really ought to name it server.