diff --git a/v2/session/json.go b/v2/session/json.go
index f8cf61d..d192b65 100644
--- a/v2/session/json.go
+++ b/v2/session/json.go
@@ -44,3 +44,23 @@ func (l *TokenLifetime) UnmarshalJSON(data []byte) error {
 
 	return nil
 }
+
+func (t *SessionTokenBody) MarshalJSON() ([]byte, error) {
+	return protojson.MarshalOptions{
+		EmitUnpopulated: true,
+	}.Marshal(
+		SessionTokenBodyToGRPCMessage(t),
+	)
+}
+
+func (t *SessionTokenBody) UnmarshalJSON(data []byte) error {
+	msg := new(session.SessionToken_Body)
+
+	if err := protojson.Unmarshal(data, msg); err != nil {
+		return err
+	}
+
+	*t = *SessionTokenBodyFromGRPCMessage(msg)
+
+	return nil
+}
diff --git a/v2/session/json_test.go b/v2/session/json_test.go
index add7614..10eda4e 100644
--- a/v2/session/json_test.go
+++ b/v2/session/json_test.go
@@ -30,3 +30,15 @@ func TestTokenLifetimeJSON(t *testing.T) {
 
 	require.Equal(t, l, l2)
 }
+
+func TestSessionTokenBodyJSON(t *testing.T) {
+	b := generateSessionTokenBody("id")
+
+	data, err := b.MarshalJSON()
+	require.NoError(t, err)
+
+	b2 := new(session.SessionTokenBody)
+	require.NoError(t, b2.UnmarshalJSON(data))
+
+	require.Equal(t, b, b2)
+}
diff --git a/v2/session/marshal.go b/v2/session/marshal.go
index 2e103a0..437147d 100644
--- a/v2/session/marshal.go
+++ b/v2/session/marshal.go
@@ -366,6 +366,17 @@ func (t *SessionTokenBody) StableSize() (size int) {
 	return size
 }
 
+func (t *SessionTokenBody) Unmarshal(data []byte) error {
+	m := new(session.SessionToken_Body)
+	if err := goproto.Unmarshal(data, m); err != nil {
+		return err
+	}
+
+	*t = *SessionTokenBodyFromGRPCMessage(m)
+
+	return nil
+}
+
 func (t *SessionToken) StableMarshal(buf []byte) ([]byte, error) {
 	if t == nil {
 		return []byte{}, nil
diff --git a/v2/session/marshal_test.go b/v2/session/marshal_test.go
index 059aa84..1dc5397 100644
--- a/v2/session/marshal_test.go
+++ b/v2/session/marshal_test.go
@@ -90,16 +90,14 @@ func TestObjectSessionContext_StableMarshal(t *testing.T) {
 
 func TestSessionTokenBody_StableMarshal(t *testing.T) {
 	sessionTokenBodyFrom := generateSessionTokenBody("Session Token Body")
-	transport := new(grpc.SessionToken_Body)
 
 	t.Run("non empty", func(t *testing.T) {
 		wire, err := sessionTokenBodyFrom.StableMarshal(nil)
 		require.NoError(t, err)
 
-		err = goproto.Unmarshal(wire, transport)
-		require.NoError(t, err)
+		sessionTokenBodyTo := new(session.SessionTokenBody)
+		require.NoError(t, sessionTokenBodyTo.Unmarshal(wire))
 
-		sessionTokenBodyTo := session.SessionTokenBodyFromGRPCMessage(transport)
 		require.Equal(t, sessionTokenBodyFrom, sessionTokenBodyTo)
 	})
 }