*/
extern int j_add(struct json_object *obj, const char *key, struct json_object *val);
extern int j_add_string(struct json_object *obj, const char *key, const char *val);
*/
extern int j_add(struct json_object *obj, const char *key, struct json_object *val);
extern int j_add_string(struct json_object *obj, const char *key, const char *val);