This is used in a bot that I made, currently running on heroku and serving up tweets for @mimi_mcbot. The text generation algorithm is from this book (look at pg. 24).
A barebones Node.js app using Express 4.
This application supports the Getting Started with Node on Heroku article - check it out.
Make sure you have Node.js and the Heroku CLI installed.
$ git clone git@github.com:heroku/node-js-getting-started.git # or clone your own fork
$ cd node-js-getting-started
$ npm install
$ npm start
Your app should now be running on localhost:5000.
$ heroku create
$ git push heroku master
$ heroku open
or
For more information about using Node.js on Heroku, see these Dev Center articles: