JavaScript value is undefined from exporting object in nodejs undefined value from json,value undefined in javascript,value undefined

In my app.js file I have I am exporting an object with properties and values. On the route, I am including the file but I am getting the value as undefined. If I don't pass in the argument "users" in the createUser function it returns the value as undefined. If I pass in the argument, the server crashes and says it cannot get the .id of undefined. My goal is to have the value increment by 1 when the path is reached.

My app.js file:

exports.users = {
    id : 1,
    room : 0
};
var express = require('express');
var app = express();
var enter = require('./routes/enter');
var chat = require('./routes/chat');
var room = require('./routes/room');
var user = require('./routes/user');
var update = require('./routes/update');


app.use('/room', room);
app.use('/user', user);
app.use('/enter', enter);
app.use('/chat', chat);
app.use('/update', update);
app.use(express.static('public/dist'));
app.use(express.static('public/js'));
app.use(express.static('public/dist/images'));
app.use(express.static('bower_components'));

app.listen(1337);

My user file:

var express = require('express');
var user = express.Router();
var room = require('./room.js');
var users = require('../app.js').users;


user.get('/', function(req, res) {

    createUser();
    res.send(users.id.toString());
});

function createUser(){
    users.id = users.id + 1;
    console.log(user.id + ' this is the user.id');
    return users;
}
module.exports = user;

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