code: def jpath_exists(structure, jpath):
      
      result = jpath_value(structure, jpath)
      if not result is None:
          return True
      return False
docs: Check if node at given JPath within given data structure does exist.
  
      :param str structure: data structure to be searched
      :param str jpath: JPath to be evaluated
      :return: True or False
      :rtype: bool