robobrowser to deal with response in json

Question

I'm trying to programmably access a website

from robobrowser import RoboBrowser
import sys

browser = RoboBrowser(history=True)
browser.open('https://test.com/login')
loginForm = browser.get_form()
loginForm['UserName']='username'
loginForm['Password']='*'
browser.submit_form(loginForm)
if browser.response.ok: 
   if browser.response.content[2]=='false':
       print browser.response.content[4]
       sys.exit(1)

website returned json format ( at least i think it's json), but i can't seems to find robobrowser api for dealing with json.

{"RedirectUrl":null,"IsSuccess":false,"Message":null,"CustomMessage":null,"Errors":[{"Key":"CaptchaValue","Value":["Your response did not match. Please try again."]}],"Messages":{},"HasView":true.......}

As you can see I want to test if "isSuccess", and print error message, how can I proceed in this case?

thanks

Answer 1

found a solution using json

json.load(StringIO(browser.response.content))