diff --git a/src/blackmisc/aviation/aircraftenginelist.h b/src/blackmisc/aviation/aircraftenginelist.h
index a3cfa2f2f..8f665bfd8 100644
--- a/src/blackmisc/aviation/aircraftenginelist.h
+++ b/src/blackmisc/aviation/aircraftenginelist.h
@@ -48,10 +48,10 @@ namespace BlackMisc
             virtual void convertFromQVariant(const QVariant &variant) override { BlackMisc::setFromQVariant(this, variant); }
 
             //! \copydoc CValueObject::toJson
-            virtual QJsonObject toJson() const override;
+            QJsonObject toJson() const;
 
             //! \copydoc CValueObject::convertFromJson
-            virtual void convertFromJson(const QJsonObject &json) override;
+            void convertFromJson(const QJsonObject &json);
 
             //! Register metadata
             static void registerMetadata();
diff --git a/src/blackmisc/containerbase.h b/src/blackmisc/containerbase.h
index 696b941cf..7755a4913 100644
--- a/src/blackmisc/containerbase.h
+++ b/src/blackmisc/containerbase.h
@@ -122,7 +122,7 @@ namespace BlackMisc
         friend uint qHash(const C<T> &) { return 0; }
 
         //! \copydoc CValueObject::toJson
-        virtual QJsonObject toJson() const override
+        QJsonObject toJson() const
         {
             QJsonArray array;
             QJsonObject json;
@@ -135,7 +135,7 @@ namespace BlackMisc
         }
 
         //! \copydoc CValueObject::convertFromJson
-        virtual void convertFromJson(const QJsonObject &json) override
+        void convertFromJson(const QJsonObject &json)
         {
             QJsonArray array = json.value("containerbase").toArray();
             for (auto i = array.begin(); i != array.end(); ++i)
diff --git a/src/blackmisc/dictionary.h b/src/blackmisc/dictionary.h
index 8bcfd350f..0349f6230 100644
--- a/src/blackmisc/dictionary.h
+++ b/src/blackmisc/dictionary.h
@@ -233,7 +233,7 @@ namespace BlackMisc
         virtual void convertFromQVariant(const QVariant &variant) override { BlackMisc::setFromQVariant(this, variant); }
 
         //! \copydoc CValueObject::toJson
-        virtual QJsonObject toJson() const override
+        QJsonObject toJson() const
         {
             QJsonArray array;
             QJsonObject json;
@@ -247,7 +247,7 @@ namespace BlackMisc
         }
 
         //! \copydoc CValueObject::convertFromJson
-        virtual void convertFromJson(const QJsonObject &json) override
+        void convertFromJson(const QJsonObject &json)
         {
             QJsonArray array = json.value("associativecontainerbase").toArray();
             for (auto it = array.begin(); it != array.end(); ++it)
diff --git a/src/blackmisc/pq/physicalquantity.h b/src/blackmisc/pq/physicalquantity.h
index b60c9cf94..1e3278274 100644
--- a/src/blackmisc/pq/physicalquantity.h
+++ b/src/blackmisc/pq/physicalquantity.h
@@ -205,10 +205,10 @@ namespace BlackMisc
             friend uint qHash(const PQ &pq) { return pq.getValueHash(); };
 
             //! \copydoc CValueObject::toJson
-            virtual QJsonObject toJson() const override;
+            QJsonObject toJson() const;
 
             //! \copydoc CValueObject::convertFromJson
-            virtual void convertFromJson(const QJsonObject &json) override;
+            void convertFromJson(const QJsonObject &json);
 
             //! Parse to string, with specified separator
             virtual void parseFromString(const QString &value, CPqString::SeparatorMode mode);
diff --git a/src/blackmisc/simulation/simulatorplugininfo.h b/src/blackmisc/simulation/simulatorplugininfo.h
index de9834f1b..71676919f 100644
--- a/src/blackmisc/simulation/simulatorplugininfo.h
+++ b/src/blackmisc/simulation/simulatorplugininfo.h
@@ -42,7 +42,8 @@ namespace BlackMisc
             //! Default constructor
             CSimulatorPluginInfo() = default;
 
-            virtual void convertFromJson(const QJsonObject &json) override;
+            //! \copydoc BlackMisc::CValueObject::convertFromJson
+            void convertFromJson(const QJsonObject &json);
 
             //! Unspecified simulator
             bool isUnspecified() const;
diff --git a/src/blackmisc/valueobject.h b/src/blackmisc/valueobject.h
index d041921d2..87fd760ef 100644
--- a/src/blackmisc/valueobject.h
+++ b/src/blackmisc/valueobject.h
@@ -105,18 +105,6 @@ namespace BlackMisc
     //! Dummy comparison.
     inline int compare(const CEmpty &, const CEmpty &) { return 0; }
 
-    /*!
-     * Terminating base cases for the recursive methods of CValueObject.
-     */
-    struct CValueObjectDummyBase
-    {
-        //! To JSON
-        static QJsonObject toJson() { return {}; }
-
-        //! From JSON
-        static void convertFromJson(const QJsonObject &) {}
-    };
-
     /*!
      * Default policy classes for use by CValueObject.
      *
@@ -353,6 +341,130 @@ namespace BlackMisc
             static void baseUnmarshall(CEmpty &, const QDBusArgument &) {}
         };
 
+        /*!
+         * CRTP class template from which a derived class can inherit common methods dealing with JSON by metatuple.
+         */
+        template <class Derived, bool IsTupleBased = true>
+        class JsonByTuple : private Private::EncapsulationBreaker
+        {
+        public:
+            //! operator >> for JSON
+            friend const QJsonObject &operator>>(const QJsonObject &json, Derived &obj)
+            {
+                obj.convertFromJson(json);
+                return json;
+            }
+
+            //! operator >> for JSON
+            friend const QJsonValue &operator>>(const QJsonValue &json, Derived &obj)
+            {
+                obj.convertFromJson(json.toObject());
+                return json;
+            }
+
+            //! operator >> for JSON
+            friend const QJsonValueRef &operator>>(const QJsonValueRef &json, Derived &obj)
+            {
+                obj.convertFromJson(json.toObject());
+                return json;
+            }
+
+            //! operator << for JSON
+            friend QJsonArray &operator<<(QJsonArray &json, const Derived &obj)
+            {
+                json.append(obj.toJson());
+                return json;
+            }
+
+            //! operator << for JSON
+            friend QJsonObject &operator<<(QJsonObject &json, const std::pair<QString, const Derived &> &value)
+            {
+                json.insert(value.first, QJsonValue(value.second.toJson()));
+                return json;
+            }
+
+            //! Cast to JSON object
+            QJsonObject toJson() const
+            {
+                QJsonObject json = BlackMisc::serializeJson(Private::EncapsulationBreaker::toMetaTuple(*derived()));
+                return Json::appendJsonObject(json, baseToJson(static_cast<const typename Derived::base_type &>(*derived())));
+            }
+
+            //! Assign from JSON object
+            void convertFromJson(const QJsonObject &json)
+            {
+                baseConvertFromJson(static_cast<typename Derived::base_type &>(*derived()), json);
+                BlackMisc::deserializeJson(json, Private::EncapsulationBreaker::toMetaTuple(*derived()));
+            }
+
+        private:
+            const Derived *derived() const { return static_cast<const Derived *>(this); }
+            Derived *derived() { return static_cast<Derived *>(this); }
+
+            template <typename T> static QJsonObject baseToJson(const T &base) { return base.toJson(); }
+            template <typename T> static void baseConvertFromJson(T &base, const QJsonObject &json) { base.convertFromJson(json); }
+            static QJsonObject baseToJson(const CEmpty &) { return {}; }
+            static void baseConvertFromJson(CEmpty &, const QJsonObject &) {}
+        };
+
+        /*!
+         * Specialization of JsonByTuple for classes not registered with the tuple system.
+         */
+        template <class Derived>
+        class JsonByTuple<Derived, false>
+        {
+        public:
+            //! operator >> for JSON
+            friend const QJsonObject &operator>>(const QJsonObject &json, Derived &obj)
+            {
+                obj.convertFromJson(json);
+                return json;
+            }
+
+            //! operator >> for JSON
+            friend const QJsonValue &operator>>(const QJsonValue &json, Derived &obj)
+            {
+                obj.convertFromJson(json.toObject());
+                return json;
+            }
+
+            //! operator >> for JSON
+            friend const QJsonValueRef &operator>>(const QJsonValueRef &json, Derived &obj)
+            {
+                obj.convertFromJson(json.toObject());
+                return json;
+            }
+
+            //! operator << for JSON
+            friend QJsonArray &operator<<(QJsonArray &json, const Derived &obj)
+            {
+                json.append(obj.toJson());
+                return json;
+            }
+
+            //! operator << for JSON
+            friend QJsonObject &operator<<(QJsonObject &json, const std::pair<QString, const Derived &> &value)
+            {
+                json.insert(value.first, QJsonValue(value.second.toJson()));
+                return json;
+            }
+
+            //! Do nothing
+            QJsonObject toJson() const { return baseToJson(static_cast<const typename Derived::base_type &>(*derived())); }
+
+            //! Do nothing
+            void convertFromJson(const QJsonObject &json) { baseConvertFromJson(static_cast<typename Derived::base_type &>(*derived()), json); }
+
+        private:
+            const Derived *derived() const { return static_cast<const Derived *>(this); }
+            Derived *derived() { return static_cast<Derived *>(this); }
+
+            template <typename T> static QJsonObject baseToJson(const T &base) { return base.toJson(); }
+            template <typename T> static void baseConvertFromJson(T &base, const QJsonObject &json) { base.convertFromJson(json); }
+            static QJsonObject baseToJson(const CEmpty &) { return {}; }
+            static void baseConvertFromJson(CEmpty &, const QJsonObject &) {}
+        };
+
     }
 
     /*!
@@ -370,17 +482,15 @@ namespace BlackMisc
         public Mixin::MetaType<Derived>,
         public Mixin::HashByTuple<Derived, Policy::Hash::IsMetaTuple<Derived, Base>::value>,
         public Mixin::DBusByTuple<Derived, Policy::DBus::IsMetaTuple<Derived, Base>::value>,
+        public Mixin::JsonByTuple<Derived, Policy::Json::IsMetaTuple<Derived, Base>::value>,
         private CValueObjectPolicy<Derived>::Equals::template Ops<Derived, Base>,
         private CValueObjectPolicy<Derived>::LessThan::template Ops<Derived, Base>,
         private CValueObjectPolicy<Derived>::Compare::template Ops<Derived, Base>
     {
         static_assert(std::is_same<CEmpty, Base>::value || IsValueObject<Base>::value, "Base must be either CEmpty or derived from CValueObject");
 
-        using JsonPolicy = typename CValueObjectPolicy<Derived>::Json;
         using PropertyIndexPolicy = typename CValueObjectPolicy<Derived>::PropertyIndex;
 
-        using BaseOrDummy = typename std::conditional<std::is_same<Base, CEmpty>::value, CValueObjectDummyBase, Base>::type;
-
         //! Stream << overload to be used in debugging messages
         friend QDebug operator<<(QDebug debug, const Derived &obj)
         {
@@ -416,41 +526,6 @@ namespace BlackMisc
             return ostr;
         }
 
-        //! operator >> for JSON
-        friend const QJsonObject &operator>>(const QJsonObject &json, Derived &valueObject)
-        {
-            valueObject.convertFromJson(json);
-            return json;
-        }
-
-        //! operator >> for JSON
-        friend const QJsonValue &operator>>(const QJsonValue &json, Derived &valueObject)
-        {
-            valueObject.convertFromJson(json.toObject());
-            return json;
-        }
-
-        //! operator >> for JSON
-        friend const QJsonValueRef &operator>>(const QJsonValueRef &json, Derived &valueObject)
-        {
-            valueObject.convertFromJson(json.toObject());
-            return json;
-        }
-
-        //! operator << for JSON
-        friend QJsonArray &operator<<(QJsonArray &json, const Derived &value)
-        {
-            json.append(value.toJson());
-            return json;
-        }
-
-        //! operator << for JSON
-        friend QJsonObject& operator<<(QJsonObject &json, const std::pair<QString, const Derived &> &value)
-        {
-            json.insert(value.first, QJsonValue(value.second.toJson()));
-            return json;
-        }
-
     public:
         //! Base class
         using base_type = Base;
@@ -485,19 +560,11 @@ namespace BlackMisc
         //! \copydoc BlackMisc::Mixin::MetaType::convertFromCVariant
         using Mixin::MetaType<Derived>::convertFromCVariant;
 
-        //! Cast to JSON object
-        virtual QJsonObject toJson() const
-        {
-            QJsonObject json = JsonPolicy::serializeImpl(*derived());
-            return Json::appendJsonObject(json, BaseOrDummy::toJson());
-        }
+        //! \copydoc BlackMisc::Mixin::JsonByTuple::toJson
+        using Mixin::JsonByTuple<Derived, Policy::Json::IsMetaTuple<Derived, Base>::value>::toJson;
 
-        //! Assign from JSON object
-        virtual void convertFromJson(const QJsonObject &json)
-        {
-            BaseOrDummy::convertFromJson(json);
-            JsonPolicy::deserializeImpl(json, *derived());
-        }
+        //! \copydoc BlackMisc::Mixin::JsonByTuple::convertFromJson
+        using Mixin::JsonByTuple<Derived, Policy::Json::IsMetaTuple<Derived, Base>::value>::convertFromJson;
 
         //! \copydoc BlackMisc::Mixin::MetaType::toQVariant
         using Mixin::MetaType<Derived>::toQVariant;
diff --git a/src/blackmisc/valueobject_policy.h b/src/blackmisc/valueobject_policy.h
index 77bfd231f..7c2c4813c 100644
--- a/src/blackmisc/valueobject_policy.h
+++ b/src/blackmisc/valueobject_policy.h
@@ -395,6 +395,11 @@ namespace BlackMisc
                 template <class T, class...>
                 static void deserializeImpl(const QJsonObject &, T &) {}
             };
+
+            //! \private Detect the policy of T, following inheritance.
+            template <class T, class B, class P = typename CValueObjectPolicy<T>::Json> struct IsMetaTuple : public std::false_type {};
+            template <class T, class B> struct IsMetaTuple<T, B, MetaTuple> : public std::true_type {};
+            template <class T, class B> struct IsMetaTuple<T, B, Inherit> : public IsMetaTuple<B, typename B::base_type> {};
         }
 
         namespace PropertyIndex
diff --git a/src/blackmisc/variant.h b/src/blackmisc/variant.h
index cb4bbbe0f..beb7aff80 100644
--- a/src/blackmisc/variant.h
+++ b/src/blackmisc/variant.h
@@ -179,10 +179,10 @@ namespace BlackMisc
         int userType() const { return m_v.userType(); }
 
         //! \copydoc CValueObject::toJson
-        virtual QJsonObject toJson() const override;
+        QJsonObject toJson() const;
 
         //! \copydoc CValueObject::convertFromJson
-        virtual void convertFromJson(const QJsonObject &json) override;
+        void convertFromJson(const QJsonObject &json);
 
         //! \copydoc CValueObject::marshallToDbus
         void marshallToDbus(QDBusArgument &argument) const;