diff --git a/include/Deserializable.h b/include/Deserializable.h
index 76290e1b7d2c8df8e939f10bf79f572e9ca89cf5..f4e8f425032f74e79a09070b450f53ed75298058 100644
--- a/include/Deserializable.h
+++ b/include/Deserializable.h
@@ -47,3 +47,9 @@ public:
 	{
 	}
 };
+
+class Serializable
+{
+public:
+	virtual QJsonObject serialize() const = 0;
+};
diff --git a/include/events/AliasesEventContent.h b/include/events/AliasesEventContent.h
index a21aefd4771063e9fb4805d893271d9f42eec391..3adf8d46e951032d7c6cb06e1bf016c4f7283a96 100644
--- a/include/events/AliasesEventContent.h
+++ b/include/events/AliasesEventContent.h
@@ -26,10 +26,11 @@ namespace matrix
 {
 namespace events
 {
-class AliasesEventContent : public Deserializable
+class AliasesEventContent : public Deserializable, public Serializable
 {
 public:
 	void deserialize(const QJsonValue &data) override;
+	QJsonObject serialize() const override;
 
 	inline QList<QString> aliases() const;
 
diff --git a/include/events/AvatarEventContent.h b/include/events/AvatarEventContent.h
index fa6997e0d5dda6c48bb74e01073ab82cbd47e1ef..43be31221af3b893d038a00cd0163b33eb1094f2 100644
--- a/include/events/AvatarEventContent.h
+++ b/include/events/AvatarEventContent.h
@@ -30,10 +30,11 @@ namespace events
  * A picture that is associated with the room.
  */
 
-class AvatarEventContent : public Deserializable
+class AvatarEventContent : public Deserializable, public Serializable
 {
 public:
 	void deserialize(const QJsonValue &data) override;
+	QJsonObject serialize() const override;
 
 	inline QUrl url() const;
 
diff --git a/include/events/CanonicalAliasEventContent.h b/include/events/CanonicalAliasEventContent.h
index 00df620740146a2a25404c7f3fede1bb51f1b10b..aed7ea6bd948515f61d9363a66ff35945876d500 100644
--- a/include/events/CanonicalAliasEventContent.h
+++ b/include/events/CanonicalAliasEventContent.h
@@ -32,10 +32,11 @@ namespace events
  * users which alias to use to advertise the room.
  */
 
-class CanonicalAliasEventContent : public Deserializable
+class CanonicalAliasEventContent : public Deserializable, public Serializable
 {
 public:
 	void deserialize(const QJsonValue &data) override;
+	QJsonObject serialize() const override;
 
 	inline QString alias() const;
 
diff --git a/include/events/CreateEventContent.h b/include/events/CreateEventContent.h
index a0e40fb82af025c2e66dd217deb4c274b0a64ed2..eedee9f1989e045972e3716440cecc662ba3c8b3 100644
--- a/include/events/CreateEventContent.h
+++ b/include/events/CreateEventContent.h
@@ -29,10 +29,11 @@ namespace events
  * This is the first event in a room and cannot be changed. It acts as the root of all other events.
  */
 
-class CreateEventContent : public Deserializable
+class CreateEventContent : public Deserializable, public Serializable
 {
 public:
 	void deserialize(const QJsonValue &data) override;
+	QJsonObject serialize() const override;
 
 	inline QString creator() const;
 
diff --git a/include/events/Event.h b/include/events/Event.h
index ea3eecea70a57aa61a83ddd8375fea56a668662c..af5386445701d75fb1134e5352ae17a0679d76e8 100644
--- a/include/events/Event.h
+++ b/include/events/Event.h
@@ -17,6 +17,7 @@
 
 #pragma once
 
+#include <QDebug>
 #include <QJsonValue>
 
 #include "Deserializable.h"
@@ -58,13 +59,14 @@ bool isMessageEvent(EventType type);
 bool isStateEvent(EventType type);
 
 template <class Content>
-class Event : public Deserializable
+class Event : public Deserializable, public Serializable
 {
 public:
 	inline Content content() const;
 	inline EventType eventType() const;
 
 	void deserialize(const QJsonValue &data) override;
+	QJsonObject serialize() const override;
 
 private:
 	Content content_;
@@ -92,6 +94,56 @@ void Event<Content>::deserialize(const QJsonValue &data)
 	auto object = data.toObject();
 
 	content_.deserialize(object.value("content"));
+	type_ = extractEventType(object);
+}
+
+template <class Content>
+QJsonObject Event<Content>::serialize() const
+{
+	QJsonObject object;
+
+	switch (type_) {
+	case EventType::RoomAliases:
+		object["type"] = "m.room.aliases";
+		break;
+	case EventType::RoomAvatar:
+		object["type"] = "m.room.avatar";
+		break;
+	case EventType::RoomCanonicalAlias:
+		object["type"] = "m.room.canonical_alias";
+		break;
+	case EventType::RoomCreate:
+		object["type"] = "m.room.create";
+		break;
+	case EventType::RoomHistoryVisibility:
+		object["type"] = "m.room.history_visibility";
+		break;
+	case EventType::RoomJoinRules:
+		object["type"] = "m.room.join_rules";
+		break;
+	case EventType::RoomMember:
+		object["type"] = "m.room.member";
+		break;
+	case EventType::RoomMessage:
+		object["type"] = "m.room.message";
+		break;
+	case EventType::RoomName:
+		object["type"] = "m.room.name";
+		break;
+	case EventType::RoomPowerLevels:
+		object["type"] = "m.room.power_levels";
+		break;
+	case EventType::RoomTopic:
+		object["type"] = "m.room.topic";
+		break;
+	case EventType::Unsupported:
+		qWarning() << "Unsupported type to serialize";
+		break;
+	}
+
+	object["content"] = content_.serialize();
+
+	return object;
 }
 }  // namespace events
 }  // namespace matrix
diff --git a/include/events/HistoryVisibilityEventContent.h b/include/events/HistoryVisibilityEventContent.h
index 1df83d09929edf884702e60126e9d888b603966b..3edc7ce57c7e3ac4163b9f66f77d48b88fc19476 100644
--- a/include/events/HistoryVisibilityEventContent.h
+++ b/include/events/HistoryVisibilityEventContent.h
@@ -32,12 +32,13 @@ enum class HistoryVisibility {
 	WorldReadable,
 };
 
-class HistoryVisibilityEventContent : public Deserializable
+class HistoryVisibilityEventContent : public Deserializable, public Serializable
 {
 public:
 	inline HistoryVisibility historyVisibility() const;
 
 	void deserialize(const QJsonValue &data) override;
+	QJsonObject serialize() const override;
 
 private:
 	HistoryVisibility history_visibility_;
diff --git a/include/events/JoinRulesEventContent.h b/include/events/JoinRulesEventContent.h
index 746188e4ec10659da9ab350a3c31450dc104cdfe..9b07e9a6be5b52875e7bfdc47549b2a18e7ae068 100644
--- a/include/events/JoinRulesEventContent.h
+++ b/include/events/JoinRulesEventContent.h
@@ -44,10 +44,11 @@ enum class JoinRule {
  * Describes how users are allowed to join the room.
  */
 
-class JoinRulesEventContent : public Deserializable
+class JoinRulesEventContent : public Deserializable, public Serializable
 {
 public:
 	void deserialize(const QJsonValue &data) override;
+	QJsonObject serialize() const override;
 
 	inline JoinRule joinRule() const;
 
diff --git a/include/events/MemberEventContent.h b/include/events/MemberEventContent.h
index e61d0cda1976d7f4330c648ffd0df71de8357f7b..feaf15595b81dc47286a8197ffade38f1e06b3fa 100644
--- a/include/events/MemberEventContent.h
+++ b/include/events/MemberEventContent.h
@@ -47,10 +47,11 @@ enum class Membership {
  * The current membership state of a user in the room.
  */
 
-class MemberEventContent : public Deserializable
+class MemberEventContent : public Deserializable, public Serializable
 {
 public:
 	void deserialize(const QJsonValue &data) override;
+	QJsonObject serialize() const override;
 
 	inline QUrl avatarUrl() const;
 	inline QString displayName() const;
diff --git a/include/events/MessageEventContent.h b/include/events/MessageEventContent.h
index a9d7e47024b300c6a81162fa2e4a50243a4539ad..3bfd11c24aa43270ad521d47d6ecb1a3e900c916 100644
--- a/include/events/MessageEventContent.h
+++ b/include/events/MessageEventContent.h
@@ -56,10 +56,11 @@ enum class MessageEventType {
 
 MessageEventType extractMessageEventType(const QJsonObject &data);
 
-class MessageEventContent : public Deserializable
+class MessageEventContent : public Deserializable, public Serializable
 {
 public:
 	void deserialize(const QJsonValue &data) override;
+	QJsonObject serialize() const override;
 
 	inline QString body() const;
 
diff --git a/include/events/NameEventContent.h b/include/events/NameEventContent.h
index bf5a92095182425a1604587f32ec1cd0ed19b023..ab90fd23fa15341045ca867335111478d5286113 100644
--- a/include/events/NameEventContent.h
+++ b/include/events/NameEventContent.h
@@ -29,10 +29,11 @@ namespace events
  * A human-friendly room name designed to be displayed to the end-user.
  */
 
-class NameEventContent : public Deserializable
+class NameEventContent : public Deserializable, public Serializable
 {
 public:
 	void deserialize(const QJsonValue &data) override;
+	QJsonObject serialize() const override;
 
 	inline QString name() const;
 
diff --git a/include/events/PowerLevelsEventContent.h b/include/events/PowerLevelsEventContent.h
index e576281289f1c6539c903b1c50de309beb0f9333..7def9800c0ba32287f25ab65bb6d5cfc82fb5001 100644
--- a/include/events/PowerLevelsEventContent.h
+++ b/include/events/PowerLevelsEventContent.h
@@ -36,10 +36,11 @@ enum class PowerLevels {
  * Defines the power levels (privileges) of users in the room.
  */
 
-class PowerLevelsEventContent : public Deserializable
+class PowerLevelsEventContent : public Deserializable, public Serializable
 {
 public:
 	void deserialize(const QJsonValue &data) override;
+	QJsonObject serialize() const override;
 
 	inline int banLevel() const;
 	inline int inviteLevel() const;
diff --git a/include/events/RoomEvent.h b/include/events/RoomEvent.h
index b73d5ce96e49b15cd9a7b36cf0bd4f2364f41f6d..79fc4be25efb6c2807565c8850f0a8d497877420 100644
--- a/include/events/RoomEvent.h
+++ b/include/events/RoomEvent.h
@@ -36,6 +36,7 @@ public:
 	inline uint64_t timestamp() const;
 
 	void deserialize(const QJsonValue &data) override;
+	QJsonObject serialize() const override;
 
 private:
 	QString event_id_;
@@ -94,5 +95,18 @@ void RoomEvent<Content>::deserialize(const QJsonValue &data)
 	sender_ = object.value("sender").toString();
 	origin_server_ts_ = object.value("origin_server_ts").toDouble();
 }
+
+template <class Content>
+QJsonObject RoomEvent<Content>::serialize() const
+{
+	QJsonObject object = Event<Content>::serialize();
+
+	object["event_id"] = event_id_;
+	object["room_id"] = room_id_;
+	object["sender"] = sender_;
+	object["origin_server_ts"] = QJsonValue(static_cast<qint64>(origin_server_ts_));
+
+	return object;
+}
 }  // namespace events
 }  // namespace matrix
diff --git a/include/events/StateEvent.h b/include/events/StateEvent.h
index 2075a996a6156e81d54030ff7ab7bb1c7eda0b48..26313048d298f155126ad20618d891aee4380faf 100644
--- a/include/events/StateEvent.h
+++ b/include/events/StateEvent.h
@@ -33,6 +33,7 @@ public:
 	inline Content previousContent() const;
 
 	void deserialize(const QJsonValue &data);
+	QJsonObject serialize() const;
 
 private:
 	QString state_key_;
@@ -66,5 +67,20 @@ void StateEvent<Content>::deserialize(const QJsonValue &data)
 	if (object.contains("prev_content"))
 		prev_content_.deserialize(object.value("prev_content"));
 }
+
+template <class Content>
+QJsonObject StateEvent<Content>::serialize() const
+{
+	QJsonObject object = RoomEvent<Content>::serialize();
+
+	object["state_key"] = state_key_;
+
+	auto prev = prev_content_.serialize();
+
+	if (!prev.isEmpty())
+		object["prev_content"] = prev;
+
+	return object;
+}
 }  // namespace events
 }  // namespace matrix
diff --git a/include/events/TopicEventContent.h b/include/events/TopicEventContent.h
index 460d019e7b7996fad6300aaf427ffa42e6bfa58e..ff2fe3bb7caab3522503be258792c713153730c3 100644
--- a/include/events/TopicEventContent.h
+++ b/include/events/TopicEventContent.h
@@ -29,10 +29,11 @@ namespace events
  * A topic is a short message detailing what is currently being discussed in the room.
  */
 
-class TopicEventContent : public Deserializable
+class TopicEventContent : public Deserializable, public Serializable
 {
 public:
 	void deserialize(const QJsonValue &data) override;
+	QJsonObject serialize() const override;
 
 	inline QString topic() const;
 
diff --git a/src/events/AliasesEventContent.cc b/src/events/AliasesEventContent.cc
index 8975431563a9d814f7204ce6356b141320bdb8c8..899a7182ce46ef97ab4bd6f3ef09eab4429d9e4b 100644
--- a/src/events/AliasesEventContent.cc
+++ b/src/events/AliasesEventContent.cc
@@ -36,3 +36,18 @@ void AliasesEventContent::deserialize(const QJsonValue &data)
 	for (const auto &alias : aliases)
 		aliases_.push_back(alias.toString());
 }
+
+QJsonObject AliasesEventContent::serialize() const
+{
+	QJsonObject object;
+
+	QJsonArray aliases;
+
+	for (const auto &alias : aliases_)
+		aliases.push_back(alias);
+
+	if (aliases.size() > 0)
+		object["aliases"] = aliases;
+
+	return object;
+}
diff --git a/src/events/AvatarEventContent.cc b/src/events/AvatarEventContent.cc
index 2f88cac2b2f04dfcb7267071c7d1f2498abefe0f..dfd46f68f5ba219e929e59356a5de4744fb308bd 100644
--- a/src/events/AvatarEventContent.cc
+++ b/src/events/AvatarEventContent.cc
@@ -36,3 +36,13 @@ void AvatarEventContent::deserialize(const QJsonValue &data)
 	if (!url_.isValid())
 		qWarning() << "Invalid avatar url" << url_;
 }
+
+QJsonObject AvatarEventContent::serialize() const
+{
+	QJsonObject object;
+
+	if (!url_.isEmpty())
+		object["url"] = url_.toString();
+
+	return object;
+}
diff --git a/src/events/CanonicalAliasEventContent.cc b/src/events/CanonicalAliasEventContent.cc
index 89042722413ea6cbe399aa8bc62b48c975becade..9792027c2663a0dafec5569cd756c2ede2ab0f3b 100644
--- a/src/events/CanonicalAliasEventContent.cc
+++ b/src/events/CanonicalAliasEventContent.cc
@@ -31,3 +31,13 @@ void CanonicalAliasEventContent::deserialize(const QJsonValue &data)
 
 	alias_ = object.value("alias").toString();
 }
+
+QJsonObject CanonicalAliasEventContent::serialize() const
+{
+	QJsonObject object;
+
+	if (!alias_.isEmpty())
+		object["alias"] = alias_;
+
+	return object;
+}
diff --git a/src/events/CreateEventContent.cc b/src/events/CreateEventContent.cc
index d43a4cc542a61aa01fba41d11fed4ef7acb197f3..a7d227912bb49b40cee86e48114f34fe7164f6a5 100644
--- a/src/events/CreateEventContent.cc
+++ b/src/events/CreateEventContent.cc
@@ -31,3 +31,13 @@ void CreateEventContent::deserialize(const QJsonValue &data)
 
 	creator_ = object.value("creator").toString();
 }
+
+QJsonObject CreateEventContent::serialize() const
+{
+	QJsonObject object;
+
+	if (!creator_.isEmpty())
+		object["creator"] = creator_;
+
+	return object;
+}
diff --git a/src/events/HistoryVisibilityEventContent.cc b/src/events/HistoryVisibilityEventContent.cc
index 25630aa44dc4e3111d74cdf65be84d931550f387..779705537b09f9b5b6458a59cbd506c5c05ee077 100644
--- a/src/events/HistoryVisibilityEventContent.cc
+++ b/src/events/HistoryVisibilityEventContent.cc
@@ -42,3 +42,19 @@ void HistoryVisibilityEventContent::deserialize(const QJsonValue &data)
 	else
 		throw DeserializationException(QString("Unknown history_visibility value: %1").arg(value).toUtf8().constData());
 }
+
+QJsonObject HistoryVisibilityEventContent::serialize() const
+{
+	QJsonObject object;
+
+	if (history_visibility_ == HistoryVisibility::Invited)
+		object["history_visibility"] = "invited";
+	else if (history_visibility_ == HistoryVisibility::Joined)
+		object["history_visibility"] = "joined";
+	else if (history_visibility_ == HistoryVisibility::Shared)
+		object["history_visibility"] = "shared";
+	else if (history_visibility_ == HistoryVisibility::WorldReadable)
+		object["history_visibility"] = "world_readable";
+
+	return object;
+}
diff --git a/src/events/JoinRulesEventContent.cc b/src/events/JoinRulesEventContent.cc
index 913aa097239b59949e7bc8dafe3101548b9b0a2d..389ab9b877d143c2621c99dc7a322d05d9e2215c 100644
--- a/src/events/JoinRulesEventContent.cc
+++ b/src/events/JoinRulesEventContent.cc
@@ -42,3 +42,19 @@ void JoinRulesEventContent::deserialize(const QJsonValue &data)
 	else
 		throw DeserializationException(QString("Unknown join_rule value: %1").arg(value).toUtf8().constData());
 }
+
+QJsonObject JoinRulesEventContent::serialize() const
+{
+	QJsonObject object;
+
+	if (join_rule_ == JoinRule::Invite)
+		object["join_rule"] = "invite";
+	else if (join_rule_ == JoinRule::Knock)
+		object["join_rule"] = "knock";
+	else if (join_rule_ == JoinRule::Private)
+		object["join_rule"] = "private";
+	else if (join_rule_ == JoinRule::Public)
+		object["join_rule"] = "public";
+
+	return object;
+}
diff --git a/src/events/MemberEventContent.cc b/src/events/MemberEventContent.cc
index 4dc8ad5f74224db264f408638283ddda2437c7b5..608ad1b210a89d134ebc3a9397eacdf5f57a0260 100644
--- a/src/events/MemberEventContent.cc
+++ b/src/events/MemberEventContent.cc
@@ -55,3 +55,27 @@ void MemberEventContent::deserialize(const QJsonValue &data)
 	if (object.contains("displayname"))
 		display_name_ = object.value("displayname").toString();
 }
+
+QJsonObject MemberEventContent::serialize() const
+{
+	QJsonObject object;
+
+	if (membership_state_ == Membership::Ban)
+		object["membership"] = "ban";
+	else if (membership_state_ == Membership::Invite)
+		object["membership"] = "invite";
+	else if (membership_state_ == Membership::Join)
+		object["membership"] = "join";
+	else if (membership_state_ == Membership::Knock)
+		object["membership"] = "knock";
+	else if (membership_state_ == Membership::Leave)
+		object["membership"] = "leave";
+
+	if (!avatar_url_.isEmpty())
+		object["avatar_url"] = avatar_url_.toString();
+
+	if (!display_name_.isEmpty())
+		object["displayname"] = display_name_;
+
+	return object;
+}
diff --git a/src/events/MessageEventContent.cc b/src/events/MessageEventContent.cc
index df2c39e8b85ec25430fe87aa7da57e607040731b..215f2d97de61e0de0d9c6b43e9808e2c2744d765 100644
--- a/src/events/MessageEventContent.cc
+++ b/src/events/MessageEventContent.cc
@@ -61,3 +61,11 @@ void MessageEventContent::deserialize(const QJsonValue &data)
 
 	body_ = object.value("body").toString();
 }
+
+QJsonObject MessageEventContent::serialize() const
+{
+	// TODO: Add for all the message contents.
+	QJsonObject object;
+
+	return object;
+}
diff --git a/src/events/NameEventContent.cc b/src/events/NameEventContent.cc
index bfb2f878970fc65af6c7ca0ddeabd7ab80426ae9..61126e6b52ed7dcdf165d36edcd33334626a63e2 100644
--- a/src/events/NameEventContent.cc
+++ b/src/events/NameEventContent.cc
@@ -31,3 +31,13 @@ void NameEventContent::deserialize(const QJsonValue &data)
 
 	name_ = object.value("name").toString();
 }
+
+QJsonObject NameEventContent::serialize() const
+{
+	QJsonObject object;
+
+	if (!name_.isEmpty())
+		object["name"] = name_;
+
+	return object;
+}
diff --git a/src/events/PowerLevelsEventContent.cc b/src/events/PowerLevelsEventContent.cc
index 048b8e97b58f4b66dda0fe56f8a27b6832a11fb7..765913c48cd0029ab6c13bec66ae72297b6000ec 100644
--- a/src/events/PowerLevelsEventContent.cc
+++ b/src/events/PowerLevelsEventContent.cc
@@ -65,6 +65,34 @@ void PowerLevelsEventContent::deserialize(const QJsonValue &data)
 	}
 }
 
+QJsonObject PowerLevelsEventContent::serialize() const
+{
+	QJsonObject object;
+
+	object["ban"] = ban_;
+	object["invite"] = invite_;
+	object["kick"] = kick_;
+	object["redact"] = redact_;
+
+	object["events_default"] = events_default_;
+	object["users_default"] = users_default_;
+	object["state_default"] = state_default_;
+
+	QJsonObject users;
+	QJsonObject events;
+
+	for (auto it = users_.constBegin(); it != users_.constEnd(); it++)
+		users.insert(it.key(), it.value());
+
+	for (auto it = events_.constBegin(); it != events_.constEnd(); it++)
+		events.insert(it.key(), it.value());
+
+	object["users"] = users;
+	object["events"] = events;
+
+	return object;
+}
+
 int PowerLevelsEventContent::eventLevel(QString event_type) const
 {
 	if (events_.contains(event_type))
diff --git a/src/events/TopicEventContent.cc b/src/events/TopicEventContent.cc
index e8d99ee9c0a4d17cf01b66a61b8d07df99370bc2..5acdba3e04f1c83779abfc5e3ee148de551dbbbb 100644
--- a/src/events/TopicEventContent.cc
+++ b/src/events/TopicEventContent.cc
@@ -31,3 +31,13 @@ void TopicEventContent::deserialize(const QJsonValue &data)
 
 	topic_ = object.value("topic").toString();
 }
+
+QJsonObject TopicEventContent::serialize() const
+{
+	QJsonObject object;
+
+	if (!topic_.isEmpty())
+		object["topic"] = topic_;
+
+	return object;
+}
diff --git a/tests/events.cc b/tests/events.cc
index 3c5ed536222818d957a9836969b8f80715ac7e85..7712255c8a68d9cbc5e944d297324bd149617f21 100644
--- a/tests/events.cc
+++ b/tests/events.cc
@@ -1,4 +1,5 @@
 #include <gtest/gtest.h>
+#include <QDebug>
 #include <QJsonArray>
 
 #include "Event.h"
@@ -28,6 +29,7 @@ TEST(BaseEvent, Deserialization)
 	Event<NameEventContent> name_event;
 	name_event.deserialize(data);
 	EXPECT_EQ(name_event.content().name(), "Room Name");
+	EXPECT_EQ(name_event.serialize(), data);
 
 	// TopicEventContent
 	data = QJsonObject{
@@ -37,6 +39,7 @@ TEST(BaseEvent, Deserialization)
 	Event<TopicEventContent> topic_event;
 	topic_event.deserialize(data);
 	EXPECT_EQ(topic_event.content().topic(), "Room Topic");
+	EXPECT_EQ(topic_event.serialize(), data);
 
 	// AvatarEventContent
 	data = QJsonObject{
@@ -46,6 +49,7 @@ TEST(BaseEvent, Deserialization)
 	Event<AvatarEventContent> avatar_event;
 	avatar_event.deserialize(data);
 	EXPECT_EQ(avatar_event.content().url().toString(), "https://matrix.org");
+	EXPECT_EQ(avatar_event.serialize(), data);
 
 	// AliasesEventContent
 	data = QJsonObject{
@@ -55,6 +59,7 @@ TEST(BaseEvent, Deserialization)
 	Event<AliasesEventContent> aliases_event;
 	aliases_event.deserialize(data);
 	EXPECT_EQ(aliases_event.content().aliases().size(), 2);
+	EXPECT_EQ(aliases_event.serialize(), data);
 
 	// CreateEventContent
 	data = QJsonObject{
@@ -64,6 +69,7 @@ TEST(BaseEvent, Deserialization)
 	Event<CreateEventContent> create_event;
 	create_event.deserialize(data);
 	EXPECT_EQ(create_event.content().creator(), "@alice:matrix.org");
+	EXPECT_EQ(create_event.serialize(), data);
 
 	// JoinRulesEventContent
 	data = QJsonObject{
@@ -73,6 +79,7 @@ TEST(BaseEvent, Deserialization)
 	Event<JoinRulesEventContent> join_rules_event;
 	join_rules_event.deserialize(data);
 	EXPECT_EQ(join_rules_event.content().joinRule(), JoinRule::Private);
+	EXPECT_EQ(join_rules_event.serialize(), data);
 }
 
 TEST(BaseEvent, DeserializationException)
@@ -110,6 +117,7 @@ TEST(RoomEvent, Deserialization)
 	EXPECT_EQ(event.sender(), "@alice:matrix.org");
 	EXPECT_EQ(event.timestamp(), 1323238293289323);
 	EXPECT_EQ(event.content().name(), "Name");
+	EXPECT_EQ(event.serialize(), data);
 }
 
 TEST(RoomEvent, DeserializationException)
@@ -152,6 +160,7 @@ TEST(StateEvent, Deserialization)
 	EXPECT_EQ(event.content().name(), "Name");
 	EXPECT_EQ(event.stateKey(), "some_state_key");
 	EXPECT_EQ(event.previousContent().name(), "Previous Name");
+	EXPECT_EQ(event.serialize(), data);
 }
 
 TEST(StateEvent, DeserializationException)
@@ -199,6 +208,7 @@ TEST(AliasesEventContent, Deserialization)
 	content.deserialize(data);
 
 	EXPECT_EQ(content.aliases().size(), 2);
+	EXPECT_EQ(content.serialize(), data);
 }
 
 TEST(AliasesEventContent, NotAnObject)
@@ -232,6 +242,7 @@ TEST(AvatarEventContent, Deserialization)
 	content.deserialize(data);
 
 	EXPECT_EQ(content.url().toString(), "https://matrix.org/avatar.png");
+	EXPECT_EQ(content.serialize(), data);
 }
 
 TEST(AvatarEventContent, NotAnObject)
@@ -264,6 +275,7 @@ TEST(CreateEventContent, Deserialization)
 	content.deserialize(data);
 
 	EXPECT_EQ(content.creator(), "@alice:matrix.org");
+	EXPECT_EQ(content.serialize(), data);
 }
 
 TEST(CreateEventContent, NotAnObject)
@@ -419,6 +431,7 @@ TEST(CanonicalAliasEventContent, Deserialization)
 	content.deserialize(data);
 
 	EXPECT_EQ(content.alias(), "Room Alias");
+	EXPECT_EQ(content.serialize(), data);
 }
 
 TEST(CanonicalAliasEventContent, NotAnObject)
@@ -521,6 +534,7 @@ TEST(NameEventContent, Deserialization)
 	content.deserialize(data);
 
 	EXPECT_EQ(content.name(), "Room Name");
+	EXPECT_EQ(content.serialize(), data);
 }
 
 TEST(NameEventContent, NotAnObject)
@@ -599,6 +613,8 @@ TEST(PowerLevelsEventContent, FullDeserialization)
 	EXPECT_EQ(power_levels.eventLevel("m.message.text"), 8);
 	EXPECT_EQ(power_levels.eventLevel("m.message.image"), 9);
 	EXPECT_EQ(power_levels.eventLevel("m.message.gif"), 5);
+
+	EXPECT_EQ(power_levels.serialize(), data);
 }
 
 TEST(PowerLevelsEventContent, PartialDeserialization)
@@ -651,6 +667,7 @@ TEST(TopicEventContent, Deserialization)
 	content.deserialize(data);
 
 	EXPECT_EQ(content.topic(), "Room Topic");
+	EXPECT_EQ(content.serialize(), data);
 }
 
 TEST(TopicEventContent, NotAnObject)