diff --git a/include/ircd/json/tuple.h b/include/ircd/json/tuple.h
index 8fa301278..06a441fde 100644
--- a/include/ircd/json/tuple.h
+++ b/include/ircd/json/tuple.h
@@ -49,11 +49,11 @@ struct tuple_base
 ///
 /// Create and use a tuple to efficiently extract members from a json::object.
 /// The tuple will populate its own members during a single-pass iteration of
-/// the JSON input. If the JSON does not contain a member specified in the
-/// tuple, the value will be default initialized. If the JSON contains a member
-/// not specified in the tuple, it is ignored. If you need to know all of the
-/// members specified in the JSON dynamically, use a json::index or iterate
-/// manually.
+/// the JSON input.
+///
+/// But remember, the tuple carries very little information for you at runtime
+/// which may make it difficult to represent all JS phenomena like "undefined"
+/// and "null".
 ///
 template<class... T>
 struct tuple
@@ -63,6 +63,8 @@ struct tuple
 	using tuple_type = std::tuple<T...>;
 	using super_type = tuple<T...>;
 
+	operator json::value() const;
+
 	static constexpr size_t size();
 
 	tuple(const json::object &);
@@ -181,6 +183,13 @@ indexof(const string_view &name)
 	return equal? i : indexof<tuple, i + 1>(name);
 }
 
+template<class tuple>
+constexpr bool
+key_exists(const string_view &key)
+{
+	return indexof<tuple>(key) < size<tuple>();
+}
+
 template<size_t i,
          class tuple>
 enable_if_tuple<tuple, tuple_value_type<tuple, i> &>
@@ -801,5 +810,21 @@ operator<<(std::ostream &s, const tuple<T...> &t)
     return s;
 }
 
+template<class... T>
+tuple<T...>::operator
+json::value()
+const
+{
+	json::value ret;
+	ret.type = OBJECT;
+	ret.create_string(serialized(*this), [this]
+	(mutable_buffer buffer)
+	{
+		stringify(buffer, *this);
+	});
+	return ret;
+
+}
+
 } // namespace json
 } // namespace ircd
diff --git a/ircd/json.cc b/ircd/json.cc
index 9bf6a2cdd..a0447d5f2 100644
--- a/ircd/json.cc
+++ b/ircd/json.cc
@@ -24,20 +24,6 @@
 #include <ircd/spirit.h>
 #include <boost/fusion/include/at.hpp>
 
-BOOST_FUSION_ADAPT_STRUCT
-(
-    ircd::json::object::member,
-    ( decltype(ircd::json::object::member::first),   first )
-    ( decltype(ircd::json::object::member::second),  second )
-)
-
-BOOST_FUSION_ADAPT_STRUCT
-(
-    ircd::json::member,
-    ( decltype(ircd::json::member::first),   first )
-    ( decltype(ircd::json::member::second),  second )
-)
-
 namespace ircd::json
 {
 	namespace spirit = boost::spirit;
@@ -78,6 +64,20 @@ namespace ircd::json
 	struct ostreamer extern const ostreamer;
 }
 
+BOOST_FUSION_ADAPT_STRUCT
+(
+    ircd::json::member,
+    ( decltype(ircd::json::member::first),   first )
+    ( decltype(ircd::json::member::second),  second )
+)
+
+BOOST_FUSION_ADAPT_STRUCT
+(
+    ircd::json::object::member,
+    ( decltype(ircd::json::object::member::first),   first )
+    ( decltype(ircd::json::object::member::second),  second )
+)
+
 template<class it>
 struct ircd::json::input
 :qi::grammar<it, unused_type>