Node module.exports doen't work?

Question

Node module.exports doen't work?

I'm making node program. I want to access app.js parameter from child. I used module.exports in parent and module.parent.exports in child. But it didn't work. How can I fix it?

(/app.js)

var app = module.exports = express();

(/routes/index.js)

var app = module.exports = module.parent.exports;
var port = app.get('port');

(error message)

/Users/satoshi/Google Drive/node/testoy2/routes/index.js:7
 var port = app.get('port');
                ^
TypeError: Object #<Object> has no method 'get'
    at Object.<anonymous> (/Users/satoshi/Google Drive/node/testoy2/routes/index.js:7:17)
    at Module._compile (module.js:456:26)
    at Object.Module._extensions..js (module.js:474:10)
    at Module.load (module.js:356:32)
    at Function.Module._load (module.js:312:12)
    at Module.require (module.js:364:17)
    at require (module.js:380:17)
    at Object.<anonymous> (/Users/satoshi/Google Drive/node/testoy2/app.js:8:14)
    at Module._compile (module.js:456:26)
    at Object.Module._extensions..js (module.js:474:10)

(version)

node = v0.10.5
express = 3.2.4

javascript
node.js
express

Answer 1

You should use

var app = require("../app.js");

in your index.js.

Answer 2

You can pass the app to the routes during require:
(app.js)

...
var app = module.exports = express();
var routes = require('./routes')(app);

Then make sure to store it in routes:
(routes/index.js)

var expApp = undefined;//This variable will hold the express app
var routes = module.exports = function(app){
   expApp = app;//Now you have access to express
}

Any other exports from routes must be explicit export.