This is a sample Node application deployed to Heroku. It's a reasonably simple app - but a good foundation for understanding how to get the most out of the Heroku platform.
Getting Started on Heroku with Node.js Getting Started on Heroku Fir with Node.js Source on GitHubPlease do work through the Getting Started guide, even if you do know how to build such an application. The guide covers the basics of working with Heroku, and will familiarize you with all the concepts you need in order to build and deploy your own apps.