Heroku node.jsHello World

index.js

var http = require("http");

http.createServer(function(request, response) {
  response.writeHead(200, {"Content-Type": "text/plain"});
  response.write("Heroku world!");
  response.end();
}).listen(process.env.PORT);

package.json

{
  "name": "node-example",
  "version": "1.0.0",
  "description": "Hello world Heroku",
  "scripts": {
    "start": "node index.js"
  },

  "keywords": [
    "example",
    "heroku"
  ],
  "author": "Johan",
  "license": "MIT",
  "engines": {
    "node": "7.6.0"
  }
}