Express - call require once for many routes

My project directory looks something like this:

MyProject
    -app.js
    -routes
        -routeone
        -routetwo

Inside of my app.js file it looks like this:

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

var routeone = require('./routes/routeone');
var routetwo = require('./routes/routetwo');

app.use('/routeone', routeone);
app.use('/routetwo', routetwo);
.
.
.

Each route file looks something like this:

var express = require('express');
var router = express.Router();
var bodyParser = require('body-parser');
var urlencodedParser = bodyParser.urlencoded({
    extended: false
});

router.post('/', urlencodedParser, function(req, res, next) {
    if (!req.body.param) {
        //no parameter was provided
    } else {
        //there was a parameter provided
    }
});

module.exports = router;

As you can see I have a dependency on the bodyparser module. I need to call this module in every route and specify the options for this.I may have many more routes in the future. I would like to avoid specifying this in every single route file because say I need to change the extended:true in the future I will have to go to every file and change this. I would prefer to have this in one location. I tried adding this to to the app.js file, but then urlencodedParser can;t be found inside of the route files. I also assume this has a performance hit since every route needs to load this module.

via user2924127