If you have a html form it will most likely not being encoded as json. But even if it where it would be the request body which contained the data and not single variables.
I think you should try to `echo @"username"` and `@"password"` without the `parseJson()`. I guess that will be what you want (if jester parses the application/x-www-form-urlencoded data of the post into the params that is.
