CODEWITHSUNDEEP
node.jsexpresssocket.io
kfk
kfk

Reputation: 841

Cannot call method "on" of undefined (express and socket.io)

I want to export the socket.io object from my app.js of express

My app.js file is here: http://pastebin.com/Kfny4yVK

My bin/www file is here: http://pastebin.com/qGhPm6KE

In my app.js I do:

var app = express();
var http = require("http").Server(app);
var io = require("socket.io")(http);
exports.io = io;

In a routes file I do:

var io = require(__dirname+'/../app.js').io;

However, when I call the:

io.on

I get an undefined object error. Any idea why this is happening? It looks like nodejs is somehow modifying the io object at export? Is this possible? Is there a way to make this work?

Upvotes: 0

Views: 332

Answers (1)

Mick Cullen
Mick Cullen

Reputation: 9454

With Express v4.x I use the following to export the socket.io object.

APP.JS

var express = require('express');
var app = express();
var http = require('http').Server(app);
var io = require('socket.io')(http);
//Export sio module so socket.io can be used in other modules
module.exports.sio = io;   //ADDED this

OTHER_FILE.JS

//Import sio module from app.js
var io = require('../app.js').sio;

Upvotes: 2

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