Hello,
I noticed param-miner caused an error when it sent a request containing a valid parameter name in JSON, but didn't report it. The request was something like...
{"username":{"abc":"abc"}}
Which caused an error since username is supposed to be a string. Though, if you try {"username":"wrtqva"}, no error is caused (same response as an invalid parameter), so the parameter isn't reported. I only noticed the error by going through Logger and seeing the different responses.