How Does my Node.js Server know it's Production and not Local?

After Finally Deploying the most basic of Node.js scripts to an EC2 server to try it out, my server displays my app on :3000 like its on development instead of production. I can't find anything about it which makes me think it is so simple no one would ever not know how to do it except me, what do I need to do here to get my EC2 server knowing it is the production server?

var port;
app.configure('development', function(){
port = 3000;
app.use(express.errorHandler({ dumpExceptions: true, showStack: true }));
});

app.configure('production', function(){
port = 80;
app.use(express.errorHandler());

});