old_contents: 
  import json
  from bson import json_util
  
  from flask.wrappers import Request, cached_property
  
  def getBoolean(string):
      return {
          '1': True, 'yes': True, 'true': True, 'on': True,
          '0': False, 'no': False, 'false': False, 'off': False, '': False, None: False
      }[string.lower()]
  
  
  class ExtRequest(Request):
      @cached_property
      def json(self):
          """If the mimetype is `application/json` this will contain the
          parsed JSON data.
          """
          if self.mimetype in ('application/json','application/extjson'):
              if 'ext' in self.mimetype:
                  objhook = json_util.object_hook
              else:
                  objhook = None
  
              request_charset = self.mimetype_params.get('charset')
              if request_charset is not None:
                  j = json.loads(self.data, encoding=request_charset, object_hook=objhook )
              else:
                  j = json.loads(self.data, object_hook=objhook)
  
              return j
  
  
  
new_contents: 
  import json
  from bson import json_util
  
  from flask.wrappers import Request, cached_property
  
  def getBoolean(string):
      if string is None:
          return False
      return {
          '1': True, 'yes': True, 'true': True, 'on': True,
          '0': False, 'no': False, 'false': False, 'off': False, '': False, None: False
      }[string.lower()]
  
  
  class ExtRequest(Request):
      @cached_property
      def json(self):
          """If the mimetype is `application/json` this will contain the
          parsed JSON data.
          """
          if self.mimetype in ('application/json','application/extjson'):
              if 'ext' in self.mimetype:
                  objhook = json_util.object_hook
              else:
                  objhook = None
  
              request_charset = self.mimetype_params.get('charset')
              if request_charset is not None:
                  j = json.loads(self.data, encoding=request_charset, object_hook=objhook )
              else:
                  j = json.loads(self.data, object_hook=objhook)
  
              return j
  
  
  
subject: Add support to getBoolean function for None objects.