app.json

{
 "name": "React Tutorial Server",
 "description": "Code from the React tutorial",
 "keywords": [ "react", "reactjs", "tutorial" ],
 "repository": "https://github.com/reactjs/react-tutorial",
 "logo": "https://facebook.github.io/react/img/logo.svg",
 "website": "http://facebook.github.io/react/docs/tutorial.html",
 "success_url": "/",
 "env" : {
 "BUILDPACK_URL": "https://github.com/heroku/heroku-buildpack-nodejs.git"
 }
}