How can i change the base Url in Meanapp or Nodejs app based on Environment?

Ex:-

i run an app locally with API(returns json)

http://localhost:8000/userslist -(returns json)

what plugin can i use for changing the baseurl in Mean App?

Pls Suggest a plugin for now iam using some code to start the server:-

 app.set('port',process.env.PORT||8000)
//console.log('Your app running on Environment :-',process.env.PORT);

var server=http.createServer(app).listen(app.get('port'),function(){
    console.log('express server listening on port'+app.get('port'));
});

but i think it may not produce the required result.

Thanks For the Help in Advance !!