diff --git a/src/easy/entities/account.cpp b/src/easy/entities/account.cpp
index 3c6feda..3cff8d2 100644
--- a/src/easy/entities/account.cpp
+++ b/src/easy/entities/account.cpp
@@ -21,14 +21,6 @@
 using namespace Mastodon;
 using Account = Easy::Account;
 
-Account::Account(const string &json)
-: Entity(json)
-{}
-
-Account::Account()
-: Entity()
-{}
-
 bool Account::valid() const
 {
     const std::vector<string> attributes =
diff --git a/src/easy/entities/account.hpp b/src/easy/entities/account.hpp
index b699f02..04265a5 100644
--- a/src/easy/entities/account.hpp
+++ b/src/easy/entities/account.hpp
@@ -46,6 +46,8 @@ namespace Mastodon
     class Easy::Account : public Easy::Entity
     {
     public:
+        using Entity::Entity;
+
         /*!
          *  @brief  Describes a field. Format: name, value
          *
@@ -53,22 +55,6 @@ namespace Mastodon
          */
         using fields_pair = std::pair<const string, const string>;
 
-        /*!
-         *  @brief  Constructs an Account object from a JSON string.
-         *
-         *  @param  json    JSON string
-         *  
-         *  @since before 0.11.0
-         */
-        explicit Account(const string &json);
-
-        /*!
-         *  @brief  Constructs an empty Account object.
-         *  
-         *  @since before 0.11.0
-         */
-        Account();
-
         virtual bool valid() const;
 
         /*!
diff --git a/src/easy/entities/application.cpp b/src/easy/entities/application.cpp
index d5f3086..fc6757d 100644
--- a/src/easy/entities/application.cpp
+++ b/src/easy/entities/application.cpp
@@ -19,14 +19,6 @@
 using namespace Mastodon;
 using Application = Easy::Application;
 
-Application::Application(const string &json)
-: Entity(json)
-{}
-
-Application::Application()
-: Entity()
-{}
-
 bool Application::valid() const
 {
     return Entity::check_valid({"name"});
diff --git a/src/easy/entities/application.hpp b/src/easy/entities/application.hpp
index 63c23b5..3f6e5ed 100644
--- a/src/easy/entities/application.hpp
+++ b/src/easy/entities/application.hpp
@@ -40,21 +40,7 @@ namespace Mastodon
     class Easy::Application : public Easy::Entity
     {
     public:
-        /*!
-         *  @brief  Constructs an Application object from a JSON string.
-         *
-         *  @param  json    JSON string
-         *  
-         *  @since before 0.11.0
-         */
-        explicit Application(const string &json);
-
-        /*!
-         *  @brief  Constructs an empty Application object.
-         *  
-         *  @since before 0.11.0
-         */
-        Application();
+        using Entity::Entity;
 
         virtual bool valid() const;
 
diff --git a/src/easy/entities/attachment.cpp b/src/easy/entities/attachment.cpp
index 5a7f4dc..a6fb072 100644
--- a/src/easy/entities/attachment.cpp
+++ b/src/easy/entities/attachment.cpp
@@ -21,14 +21,6 @@
 using namespace Mastodon;
 using Attachment = Easy::Attachment;
 
-Attachment::Attachment(const string &json)
-: Entity(json)
-{}
-
-Attachment::Attachment()
-: Entity()
-{}
-
 bool Attachment::valid() const
 {
     const std::vector<string> attributes =
diff --git a/src/easy/entities/attachment.hpp b/src/easy/entities/attachment.hpp
index 62d58eb..5e2fc85 100644
--- a/src/easy/entities/attachment.hpp
+++ b/src/easy/entities/attachment.hpp
@@ -44,21 +44,7 @@ namespace Mastodon
     class Easy::Attachment : public Easy::Entity
     {
     public:
-        /*!
-         *  @brief  Constructs an Attachment object from a JSON string.
-         *
-         *  @param  json    JSON string
-         *  
-         *  @since before 0.11.0
-         */
-        explicit Attachment(const string &json);
-
-        /*!
-         *  @brief  Constructs an empty Attachment object.
-         *  
-         *  @since before 0.11.0
-         */
-        Attachment();
+        using Entity::Entity;
 
         virtual bool valid() const;
 
diff --git a/src/easy/entities/card.cpp b/src/easy/entities/card.cpp
index 615677e..0602fdd 100644
--- a/src/easy/entities/card.cpp
+++ b/src/easy/entities/card.cpp
@@ -20,14 +20,6 @@
 using namespace Mastodon;
 using Card = Easy::Card;
 
-Card::Card(const string &json)
-: Entity(json)
-{}
-
-Card::Card()
-: Entity()
-{}
-
 bool Card::valid() const
 {
     const std::vector<string> attributes =
diff --git a/src/easy/entities/card.hpp b/src/easy/entities/card.hpp
index aa7cf05..d4ee7c0 100644
--- a/src/easy/entities/card.hpp
+++ b/src/easy/entities/card.hpp
@@ -42,21 +42,7 @@ namespace Mastodon
     class Easy::Card : public Easy::Entity
     {
     public:
-        /*!
-         *  @brief  Constructs a Card object from a JSON string.
-         *
-         *  @param  json    JSON string
-         *  
-         *  @since before 0.11.0
-         */
-        explicit Card(const string &json);
-
-        /*!
-         *  @brief  Constructs an empty Card object.
-         *  
-         *  @since before 0.11.0
-         */
-        Card();
+        using Entity::Entity;
 
         virtual bool valid() const;
 
diff --git a/src/easy/entities/context.cpp b/src/easy/entities/context.cpp
index 0303720..ebf855b 100644
--- a/src/easy/entities/context.cpp
+++ b/src/easy/entities/context.cpp
@@ -20,14 +20,6 @@
 using namespace Mastodon;
 using Context = Easy::Context;
 
-Context::Context(const string &json)
-: Entity(json)
-{}
-
-Context::Context()
-: Entity()
-{}
-
 bool Context::valid() const
 {
     const std::vector<string> attributes =
diff --git a/src/easy/entities/context.hpp b/src/easy/entities/context.hpp
index 2b390fd..6442fd4 100644
--- a/src/easy/entities/context.hpp
+++ b/src/easy/entities/context.hpp
@@ -43,21 +43,7 @@ namespace Mastodon
     class Easy::Context : public Easy::Entity
     {
     public:
-        /*!
-         *  @brief  Constructs a Context object from a JSON string.
-         *
-         *  @param  json    JSON string
-         *  
-         *  @since before 0.11.0
-         */
-        explicit Context(const string &json);
-
-        /*!
-         *  @brief  Constructs an empty Context object.
-         *  
-         *  @since before 0.11.0
-         */
-        Context();
+        using Entity::Entity;
 
         virtual bool valid() const;
 
diff --git a/src/easy/entities/emoji.cpp b/src/easy/entities/emoji.cpp
index 44049b1..0a44afb 100644
--- a/src/easy/entities/emoji.cpp
+++ b/src/easy/entities/emoji.cpp
@@ -20,14 +20,6 @@
 using namespace Mastodon;
 using Emoji = Easy::Emoji;
 
-Emoji::Emoji(const string &json)
-: Entity(json)
-{}
-
-Emoji::Emoji()
-: Entity()
-{}
-
 bool Emoji::valid() const
 {
     const std::vector<string> attributes =
diff --git a/src/easy/entities/emoji.hpp b/src/easy/entities/emoji.hpp
index d1c9dcc..e1274d6 100644
--- a/src/easy/entities/emoji.hpp
+++ b/src/easy/entities/emoji.hpp
@@ -40,21 +40,7 @@ namespace Mastodon
     class Easy::Emoji : public Easy::Entity
     {
     public:
-        /*!
-         *  @brief  Constructs an Emoji object from a JSON string.
-         *
-         *  @param  json    JSON string
-         *  
-         *  @since before 0.11.0
-         */
-        explicit Emoji(const string &json);
-
-        /*!
-         *  @brief  Constructs an empty Emoji object.
-         *  
-         *  @since before 0.11.0
-         */
-        Emoji();
+        using Entity::Entity;
 
         virtual bool valid() const;
 
diff --git a/src/easy/entities/instance.cpp b/src/easy/entities/instance.cpp
index bd2045d..fa12ba9 100644
--- a/src/easy/entities/instance.cpp
+++ b/src/easy/entities/instance.cpp
@@ -22,14 +22,6 @@
 using namespace Mastodon;
 using Instance = Easy::Instance;
 
-Instance::Instance(const string &json)
-: Entity(json)
-{}
-
-Instance::Instance()
-: Entity()
-{}
-
 bool Instance::valid() const
 {
     const std::vector<string> attributes =
diff --git a/src/easy/entities/instance.hpp b/src/easy/entities/instance.hpp
index 94b6f8d..c8a4ec3 100644
--- a/src/easy/entities/instance.hpp
+++ b/src/easy/entities/instance.hpp
@@ -45,21 +45,7 @@ namespace Mastodon
     class Easy::Instance : public Easy::Entity
     {
     public:
-        /*!
-         *  @brief  Constructs an Instance object from a JSON string.
-         *
-         *  @param  json    JSON string
-         *  
-         *  @since before 0.11.0
-         */
-        explicit Instance(const string &json);
-
-        /*!
-         *  @brief  Constructs an empty Instance object.
-         *  
-         *  @since before 0.11.0
-         */
-        Instance();
+        using Entity::Entity;
 
         virtual bool valid() const;
 
diff --git a/src/easy/entities/list.cpp b/src/easy/entities/list.cpp
index c6ea2b6..38995a5 100644
--- a/src/easy/entities/list.cpp
+++ b/src/easy/entities/list.cpp
@@ -21,14 +21,6 @@ using List = Easy::List;
 using std::string;
 using std::uint64_t;
 
-List::List(const string &json)
-: Entity(json)
-{}
-
-List::List()
-: Entity()
-{}
-
 bool List::valid() const
 {
     const std::vector<string> attributes =
diff --git a/src/easy/entities/list.hpp b/src/easy/entities/list.hpp
index 9f80ffa..9bbe7b4 100644
--- a/src/easy/entities/list.hpp
+++ b/src/easy/entities/list.hpp
@@ -43,21 +43,7 @@ namespace Mastodon
     class Easy::List : public Easy::Entity
     {
     public:
-        /*!
-         *  @brief  Constructs a List object from a JSON string.
-         *
-         *  @param  json    JSON string
-         *  
-         *  @since before 0.11.0
-         */
-        explicit List(const string &json);
-
-        /*!
-         *  @brief  Constructs an empty List object.
-         *  
-         *  @since before 0.11.0
-         */
-        List();
+        using Entity::Entity;
 
         virtual bool valid() const;
 
diff --git a/src/easy/entities/mention.cpp b/src/easy/entities/mention.cpp
index 21cb9ac..b175b29 100644
--- a/src/easy/entities/mention.cpp
+++ b/src/easy/entities/mention.cpp
@@ -19,14 +19,6 @@
 using namespace Mastodon;
 using Mention = Easy::Mention;
 
-Mention::Mention(const string &json)
-: Entity(json)
-{}
-
-Mention::Mention()
-: Entity()
-{}
-
 bool Mention::valid() const
 {
     const std::vector<string> attributes =
diff --git a/src/easy/entities/mention.hpp b/src/easy/entities/mention.hpp
index 38792b8..7ba19a3 100644
--- a/src/easy/entities/mention.hpp
+++ b/src/easy/entities/mention.hpp
@@ -43,21 +43,7 @@ namespace Mastodon
     class Easy::Mention : public Easy::Entity
     {
     public:
-        /*!
-         *  @brief  Constructs a Mention object from a JSON string.
-         *
-         *  @param  json    JSON string
-         *  
-         *  @since before 0.11.0
-         */
-        explicit Mention(const string &json);
-
-        /*!
-         *  @brief  Constructs an empty Mention object.
-         *  
-         *  @since before 0.11.0
-         */
-        Mention();
+        using Entity::Entity;
 
         virtual bool valid() const;
 
diff --git a/src/easy/entities/notification.cpp b/src/easy/entities/notification.cpp
index eec08e0..dba493e 100644
--- a/src/easy/entities/notification.cpp
+++ b/src/easy/entities/notification.cpp
@@ -20,14 +20,6 @@
 using namespace Mastodon;
 using Notification = Easy::Notification;
 
-Notification::Notification(const string &json)
-: Entity(json)
-{}
-
-Notification::Notification()
-: Entity()
-{}
-
 bool Notification::valid() const
 {
     const std::vector<string> attributes =
diff --git a/src/easy/entities/notification.hpp b/src/easy/entities/notification.hpp
index 7e7797d..58cec71 100644
--- a/src/easy/entities/notification.hpp
+++ b/src/easy/entities/notification.hpp
@@ -48,21 +48,7 @@ namespace Mastodon
     class Easy::Notification : public Easy::Entity
     {
     public:
-        /*!
-         *  @brief  Constructs a Notification object from a JSON string.
-         *
-         *  @param  json    JSON string
-         *  
-         *  @since before 0.11.0
-         */
-        explicit Notification(const string &json);
-
-        /*!
-         *  @brief  Constructs an empty Notification object.
-         *  
-         *  @since before 0.11.0
-         */
-        Notification();
+        using Entity::Entity;
 
         virtual bool valid() const;
 
diff --git a/src/easy/entities/pushsubscription.cpp b/src/easy/entities/pushsubscription.cpp
index 8ea535d..1b36cbb 100644
--- a/src/easy/entities/pushsubscription.cpp
+++ b/src/easy/entities/pushsubscription.cpp
@@ -19,19 +19,11 @@
 using namespace Mastodon;
 using PushSubscription = Easy::PushSubscription;
 
-PushSubscription::PushSubscription(const string &json)
-: Entity(json)
-{}
-
 const string PushSubscription::id() const
 {
     return get_string("id");
 }
 
-PushSubscription::PushSubscription()
-: Entity()
-{}
-
 bool PushSubscription::valid() const
 {
     const std::vector<string> attributes =
diff --git a/src/easy/entities/pushsubscription.hpp b/src/easy/entities/pushsubscription.hpp
index 20f62fd..f9278db 100644
--- a/src/easy/entities/pushsubscription.hpp
+++ b/src/easy/entities/pushsubscription.hpp
@@ -42,21 +42,7 @@ namespace Mastodon
     class Easy::PushSubscription : public Easy::Entity
     {
     public:
-        /*!
-         *  @brief  Constructs an PushSubscription object from a JSON string.
-         *
-         *  @param  json    JSON string
-         *  
-         *  @since  0.14.0
-         */
-        explicit PushSubscription(const string &json);
-
-        /*!
-         *  @brief  Constructs an empty PushSubscription object.
-         *  
-         *  @since  0.14.0
-         */
-        PushSubscription();
+        using Entity::Entity;
 
         virtual bool valid() const;
 
diff --git a/src/easy/entities/relationship.cpp b/src/easy/entities/relationship.cpp
index 8a3f472..11fc717 100644
--- a/src/easy/entities/relationship.cpp
+++ b/src/easy/entities/relationship.cpp
@@ -19,14 +19,6 @@
 using namespace Mastodon;
 using Relationship = Easy::Relationship;
 
-Relationship::Relationship(const string &json)
-: Entity(json)
-{}
-
-Relationship::Relationship()
-: Entity()
-{}
-
 bool Relationship::valid() const
 {
     const std::vector<string> attributes =
diff --git a/src/easy/entities/relationship.hpp b/src/easy/entities/relationship.hpp
index 9b2642b..2a19fd2 100644
--- a/src/easy/entities/relationship.hpp
+++ b/src/easy/entities/relationship.hpp
@@ -42,21 +42,7 @@ namespace Mastodon
     class Easy::Relationship : public Easy::Entity
     {
     public:
-        /*!
-         *  @brief  Constructs a Relationship object from a JSON string.
-         *
-         *  @param  json    JSON string
-         *  
-         *  @since  before 0.11.0
-         */
-        explicit Relationship(const string &json);
-
-        /*!
-         *  @brief  Constructs an empty Relationship object.
-         *  
-         *  @since  before 0.11.0
-         */
-        Relationship();
+        using Entity::Entity;
 
         virtual bool valid() const;
 
diff --git a/src/easy/entities/report.cpp b/src/easy/entities/report.cpp
index 296e901..2a16107 100644
--- a/src/easy/entities/report.cpp
+++ b/src/easy/entities/report.cpp
@@ -19,14 +19,6 @@
 using namespace Mastodon;
 using Report = Easy::Report;
 
-Report::Report(const string &json)
-: Entity(json)
-{}
-
-Report::Report()
-: Entity()
-{}
-
 bool Report::valid() const
 {
     const std::vector<string> attributes =
diff --git a/src/easy/entities/report.hpp b/src/easy/entities/report.hpp
index 195ae22..bd98e04 100644
--- a/src/easy/entities/report.hpp
+++ b/src/easy/entities/report.hpp
@@ -41,21 +41,7 @@ namespace Mastodon
     class Easy::Report : public Easy::Entity
     {
     public:
-        /*!
-         *  @brief  Constructs a Report object from a JSON string.
-         *
-         *  @param  json    JSON string
-         *  
-         *  @since  before 0.11.0
-         */
-        explicit Report(const string &json);
-
-        /*!
-         *  @brief  Constructs an empty Report object.
-         *  
-         *  @since  before 0.11.0
-         */
-        Report();
+        using Entity::Entity;
 
         virtual bool valid() const;
 
diff --git a/src/easy/entities/results.cpp b/src/easy/entities/results.cpp
index 80ba6d0..4a21257 100644
--- a/src/easy/entities/results.cpp
+++ b/src/easy/entities/results.cpp
@@ -20,14 +20,6 @@
 using namespace Mastodon;
 using Results = Easy::Results;
 
-Results::Results(const string &json)
-: Entity(json)
-{}
-
-Results::Results()
-: Entity()
-{}
-
 bool Results::valid() const
 {
     const std::vector<string> attributes =
diff --git a/src/easy/entities/results.hpp b/src/easy/entities/results.hpp
index 8348e85..12d977a 100644
--- a/src/easy/entities/results.hpp
+++ b/src/easy/entities/results.hpp
@@ -47,21 +47,7 @@ namespace Mastodon
     class Easy::Results : public Easy::Entity
     {
     public:
-        /*!
-         *  @brief  Constructs a Results object from a JSON string.
-         *
-         *  @param  json    JSON string
-         *  
-         *  @since  before 0.11.0
-         */
-        explicit Results(const string &json);
-
-        /*!
-         *  @brief  Constructs an empty Results object.
-         *  
-         *  @since  before 0.11.0
-         */
-        Results();
+        using Entity::Entity;
 
         virtual bool valid() const;
 
diff --git a/src/easy/entities/status.cpp b/src/easy/entities/status.cpp
index ef909bf..8ee6b42 100644
--- a/src/easy/entities/status.cpp
+++ b/src/easy/entities/status.cpp
@@ -21,14 +21,6 @@
 using namespace Mastodon;
 using Status = Easy::Status;
 
-Status::Status(const string &json)
-: Entity(json)
-{}
-
-Status::Status()
-: Entity()
-{}
-
 bool Status::valid() const
 {
     const std::vector<string> attributes =
diff --git a/src/easy/entities/status.hpp b/src/easy/entities/status.hpp
index 87ff53f..ebf4e73 100644
--- a/src/easy/entities/status.hpp
+++ b/src/easy/entities/status.hpp
@@ -59,21 +59,7 @@ namespace Mastodon
     class Easy::Status : public Easy::Entity
     {
     public:
-        /*!
-         *  @brief  Constructs a Status object from a JSON string.
-         *
-         *  @param  json    JSON string
-         *  
-         *  @since  before 0.11.0
-         */
-        explicit Status(const string &json);
-
-        /*!
-         *  @brief  Constructs an empty Status object.
-         *  
-         *  @since  before 0.11.0
-         */
-        Status();
+        using Entity::Entity;
 
         virtual bool valid() const;
 
diff --git a/src/easy/entities/tag.cpp b/src/easy/entities/tag.cpp
index 03d5772..10472b2 100644
--- a/src/easy/entities/tag.cpp
+++ b/src/easy/entities/tag.cpp
@@ -22,14 +22,6 @@
 using namespace Mastodon;
 using Tag = Easy::Tag;
 
-Tag::Tag(const string &json)
-: Entity(json)
-{}
-
-Tag::Tag()
-: Entity()
-{}
-
 bool Tag::valid() const
 {
     const std::vector<string> attributes =
@@ -68,15 +60,6 @@ const std::vector<Tag::History> Tag::history() const
     return {};
 }
 
-
-Tag::History::History(const string &json)
-: Entity(json)
-{}
-
-Tag::History::History()
-: Entity()
-{}
-
 bool Tag::History::valid() const
 {
     const std::vector<string> attributes =
diff --git a/src/easy/entities/tag.hpp b/src/easy/entities/tag.hpp
index 38ee360..fc591a8 100644
--- a/src/easy/entities/tag.hpp
+++ b/src/easy/entities/tag.hpp
@@ -52,21 +52,7 @@ namespace Mastodon
         class History : public Easy::Entity
         {
         public:
-            /*!
-             *  @brief  Constructs an Tag::History object from a JSON string.
-             *
-             *  @param  json    JSON string
-             *  
-             *  @since  0.16.0
-             */
-            explicit History(const string &json);
-
-            /*!
-             *  @brief  Constructs an empty Tag::History object.
-             *  
-             *  @since  0.16.0
-             */
-            History();
+            using Entity::Entity;
 
             virtual bool valid() const;
 
@@ -92,21 +78,7 @@ namespace Mastodon
             uint64_t uses();
         };
 
-        /*!
-         *  @brief  Constructs an Tag object from a JSON string.
-         *
-         *  @param  json    JSON string
-         *  
-         *  @since  before 0.11.0
-         */
-        explicit Tag(const string &json);
-
-        /*!
-         *  @brief  Constructs an empty Tag object.
-         *  
-         *  @since  before 0.11.0
-         */
-        Tag();
+        using Entity::Entity;
 
         virtual bool valid() const;