How to pass app object to a module?

Question

My server.js is:

var express = require('express');
var app = express();

var login = require('login');
app.use('/login', login);

In my login.js:

var express = require('express');
var router = express.Router();

router.get('/', function(req, res) {
    res.render('login.jade');
});

module.exports = router;

How can I pass the app object in server.js to the scope of login.js?

Can I just instantiate var app = express(); in login.js and use that instead? Will then there be two different instances of app?

Related: [Express: How to pass app-instance to routes from a different file?](http://stackoverflow.com/questions/10090414/express-how-to-pass-app-instance-to-routes-from-a-different-file) — Josh Crozier, Feb 13 '17 at 17:13
Thanks. This is exactly what I was seeking. Tested and it worked! — Old Geezer, Feb 14 '17 at 01:21

zurfyx · Answer 1 · 2017-02-13T17:19:24.960

2

You can either export it on server.js or make it a global or pass it as a parameter.

export app;
import { app } from './server';

or

global.app = app;

or:

app.use('/login', login(app));

login.js

function(app) {
   // login stuff here
}

edited Feb 13 '17 at 17:19

answered Feb 13 '17 at 17:10

zurfyx

31,043
20
111
145

I want to organize the login stuff using `passport` in login.js, and that requires a few middleware items. – Old Geezer Feb 13 '17 at 17:14
@OldGeezer uhm, okay. I don't like using `app` anywhere but in the main file. – zurfyx Feb 13 '17 at 17:17
@OldGeezer added a third option – zurfyx Feb 13 '17 at 17:20
Thanks, but the link provided by Josh Crozier above is what I need. I also notice that the Visual Studio template for a Node.js Express app uses that same method. – Old Geezer Feb 14 '17 at 01:22

score 2 · Answer 2 · answered Feb 13 '17 at 17:10

2

in ES6(ecmascript6):

server.js
export const app = express()

login.js
import { app } from '../server'

in ES5:

server.js
module.exports: {
  app: express()
}

login.js
var app = require('path').app

answered Feb 13 '17 at 17:10

Robsonsjre

1,586
11
17

score 1 · Answer 3 · answered Feb 14 '17 at 11:55

1

In your server.js just use require('login')(app);

In your login.js:-

module.exports = function (app) {
    app.get('/', function(req, res) {
        res.render('login.jade');
    });
};

answered Feb 14 '17 at 11:55

vikas

1,000
9
19

How to pass app object to a module?

3 Answers3