Heroku setup

gistfile1.txt

(Source: http://stackoverflow.com/questions/18466943/how-can-i-get-rid-of-error-cannot-find-module-models-on-heroku)
You need to set NODE_PATH=lib to heroku's configuration variables.

NODE_PATH tells node where to find modules besides node_modules directory.

Also, you need to tell the app to read env variables in a production environment.

So...

$ heroku config:set NODE_ENV=production
$ heroku config:set NODE_PATH=lib
There is no need to modify any file for a heroku deployment.