Global Variable in app.js accessible in routes?

Question

How do i set a variable in app.js and have it be available in all the routes, atleast in the index.js file located in routes. using the express fra

Answer 1

My preferred way is to use circular dependencies*, which node supports

• in app.js define var app = module.exports = express(); as your first order of business
• Now any module required after the fact can var app = require('./app') to access it

---

app.js

var express   = require('express');
var app = module.exports = express(); //now app.js can be required to bring app into any file

//some app/middleware, config, setup, etc, including app.use(app.router)

require('./routes'); //module.exports must be defined before this line

---

routes/index.js

var app = require('./app');

app.get('/', function(req, res, next) {
  res.render('index');
});

//require in some other route files...each of which requires app independently
require('./user');
require('./blog');