code: def get_claimed_username(token):
      
      unverified_data = jwt.decode(token, options={
          'verify_signature': False
      })
  
      if 'username' not in unverified_data:
          return None
      return unverified_data['username']
docs: Given a JWT, get the username that it is claiming to be `without verifying that the signature is valid`.
  
      :param token: JWT claim
      :return: Username