How to separate all of socket.io to a different file

Question

Right now, I have app.js where I have my usual code and my socket.io code. But what I want to do is, separate every single code of socket.io into 1 different file and require that socket.io code from the different file into my main app.js. Is there any way to do it writing 2/3 lines of code into my app.js to require socket.io from a different file?

Note: I do not want to write any of my socket.io code into my app.js so I do not know if it would be possible to require('....') it into my app.js from a different file. Ideally want to separate everything within io.on('connection'){}

const express = require('express'); const http = require('http'); // socket.io is created upon http server. A way to create server const cors = require('cors'); const {Server} = require('socket.io'); const app = express(); app.use(cors()); const server = http.createServer(app); // this is to create http server with express for socket.io const io = new Server(server, { cors: { origin: "http://localhost:3000", methods: ["GET", "POST"] } }); io.on("connection", (socket) => { socket.on("newUser", (username) => { addNewUser(username, socket.id); console.log('connect print: '); printUsers(); }) socket.on("disconnect", () => { removeUser(socket.id); console.log('disconnect print: '); printUsers(); }); }) server.listen(3001, () => { console.log('server listening on port 3001'); })

arfi720 · Accepted Answer · 2022-04-11 18:48:11Z

5

There would be a few way to do this but something like below should work.

In your new file, use module.exports to export an object containing any functions or objects you want to export:

//socketio.js module.exports = { getIo: (server) => { const io = new Server(server, { //... }); io.on("connection", (socket) => { //... } //your other functions return io; } }

Then in your app.js, require it and use the object's properties:

//app.js const socketio = require('./socketio.js'); //after creating your server etc const io = socketio.getIo(server);

answered Apr 11, 2022 at 18:48

arfi720

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5 Comments

FiFi Over a year ago

Thank you so much arf. If someone comes across or finds this helpful, please upvote the answer. I have insufficient reputation to cast it myself.

arfi720 Over a year ago

Glad it helped, FiFi. You should be able to accept the answer as correct if it is so. Thanks!

FiFi Over a year ago

Done. Thanks again. Would you mind looking this as well? Having a really hard time with it. stackoverflow.com/questions/71842932/…

El7or Over a year ago

@arfi720 How can I add getBroadcast() or getSocket() to this file to access it to do somthing like this: socket.broadcast.to('game').emit('message', 'nice game');

JackTools.Net Over a year ago

socket.io/docs/v4/server-application-structure

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