You don’t necessarily want to enable analytics tracking when testing your application on your local machine, nor do you want to log all of the debug messages on your production server. Here is a simple solution to handle multiple application configurations depending on the environment it’s running in.

The issue

A few months ago we suddenly faced a very strange problem. Our webapp looked completely broken in a very specific version on iOS inside a web view of another iOS app. Something was wrong with our Javascript code, but only on this particular context. First thing that came to our minds: “how are we going to debug this if we don’t even have access to our usual development tools?”