code: def add_json(self, json_obj, **kwargs):
          
          return self.add_bytes(encoding.Json().encode(json_obj), **kwargs)
docs: Adds a json-serializable Python dict as a json file to IPFS.
  
          .. code-block:: python
  
              >>> c.add_json({'one': 1, 'two': 2, 'three': 3})
              'QmVz9g7m5u3oHiNKHj2CJX1dbG1gtismRS3g9NaPBBLbob'
  
          Parameters
          ----------
          json_obj : dict
              A json-serializable Python dictionary
  
          Returns
          -------
              str : Hash of the added IPFS object