heroku compatibility

port env var

added app.json

formatting

free dyno

README.md

@@ -1,7 +1,11 @@
 # chat-example
 
-This is the source code for a very simple chat example used for 
-the [Getting Started](http://socket.io/get-started/chat/) guide 
+This is the source code for a very simple chat example used for
+the [Getting Started](http://socket.io/get-started/chat/) guide
 of the Socket.IO website.
 
 Please refer to it to learn how to run this application.
+
+You can also spin up a free Heroku dyno to test it out:
+
+[![Deploy](https://www.herokucdn.com/deploy/button.png)](https://heroku.com/deploy?template=https://github.com/guille/chat-example)

app.json

@@ -0,0 +1,22 @@
+{
+  "name": "Socket-Chat-Example",
+  "description": "my first socket.io app",
+  "website": "https://github.com/guille/chat-example",
+  "repository": "https://github.com/guille/chat-example",
+  "logo": "https://node-js-sample.herokuapp.com/node.svg",
+  "success_url": "/",
+  "keywords": [
+    "node",
+    "express",
+    "socket.io",
+    "realtime",
+    "websocket"
+  ],
+  "scripts": {
+  },
+  "addons": [
+  ],
+  "env": {
+    "BUILDPACK_URL": "https://github.com/heroku/heroku-buildpack-nodejs"
+  }
+}

index.js

@@ -12,6 +12,6 @@ io.on('connection', function(socket){
   });
 });
 
-http.listen(3000, function(){
-  console.log('listening on *:3000');
+http.listen(process.env.PORT || 3000, function(){
+  console.log('listening on *:' + http.address().port);
 });

package.json

@@ -5,5 +5,8 @@
   "dependencies": {
     "express": "4.3.1",
     "socket.io": "1.0.2"
+  },
+  "scripts": {
+    "start": "node index.js"
   }
 }