docs: def cache_json(filename):
      """Caches the JSON-serializable output of the function to a given file
  
      Args:
          filename (str) The filename (sans directory) to store the output
  
      Returns: decorator, applicable to a function that produces JSON-serializable output
      """
      def cache_decorator(cacheable_function):
          @wraps(cacheable_function)
          def cache_wrapper(*args, **kwargs):
              path = CACHE_DIRECTORY + filename
              check_create_folder(path)
              if os.path.exists(path):
                  with open(path) as infile:
                      return json.load(infile)
              else:
                  function_output = cacheable_function(*args, **kwargs)
                  with open(path, 'w') as outfile:
                      json.dump(function_output, outfile)
                  return function_output
          return cache_wrapper
      return cache_decorator