IP address issue in nodejs project

I am using a node js application and I have several URL access available in the project like.

websocket = new WebSocket("ws://172.20.10.4:8888");

And http access

var getusersurl = "http://172.20.10.4:8888/users";

If I start the same application in another machine, The IP address will be different and I would need to modify the application.

If I am using localhost, then the application will not work when accessed from Mobile browser/

via Shamnad P S