At work I’ve been updating some mobile apps (iOS & Android) that yesterday had their web service updated to pass me two parameters I needed (by one of the other developers). Me being a dummy I forgot to ask what those two parameters were called.
So this morning I remembered my handy dev tool Charles Proxy would be able to help in this situation. It’s very easy to setup Charles to act as your proxy for your phone so that you can inspect all the traffic on your computer.
Now you should be able to see all the traffic from your phone in Charles Proxy and inspect the data. It will show data requested and responded from each URL. So in my case I was able to look at the JSON response and find the exact parameters I needed.