diff --git a/v2/session/json.go b/v2/session/json.go
index bb9489e..f8cf61d 100644
--- a/v2/session/json.go
+++ b/v2/session/json.go
@@ -24,3 +24,23 @@ func (c *ObjectSessionContext) UnmarshalJSON(data []byte) error {
 
 	return nil
 }
+
+func (l *TokenLifetime) MarshalJSON() ([]byte, error) {
+	return protojson.MarshalOptions{
+		EmitUnpopulated: true,
+	}.Marshal(
+		TokenLifetimeToGRPCMessage(l),
+	)
+}
+
+func (l *TokenLifetime) UnmarshalJSON(data []byte) error {
+	msg := new(session.SessionToken_Body_TokenLifetime)
+
+	if err := protojson.Unmarshal(data, msg); err != nil {
+		return err
+	}
+
+	*l = *TokenLifetimeFromGRPCMessage(msg)
+
+	return nil
+}
diff --git a/v2/session/json_test.go b/v2/session/json_test.go
index d76b6f4..add7614 100644
--- a/v2/session/json_test.go
+++ b/v2/session/json_test.go
@@ -18,3 +18,15 @@ func TestChecksumJSON(t *testing.T) {
 
 	require.Equal(t, ctx, ctx2)
 }
+
+func TestTokenLifetimeJSON(t *testing.T) {
+	l := generateLifetime(1, 2, 3)
+
+	data, err := l.MarshalJSON()
+	require.NoError(t, err)
+
+	l2 := new(session.TokenLifetime)
+	require.NoError(t, l2.UnmarshalJSON(data))
+
+	require.Equal(t, l, l2)
+}
diff --git a/v2/session/marshal.go b/v2/session/marshal.go
index 34e038e..2e103a0 100644
--- a/v2/session/marshal.go
+++ b/v2/session/marshal.go
@@ -225,6 +225,17 @@ func (l *TokenLifetime) StableSize() (size int) {
 	return size
 }
 
+func (l *TokenLifetime) Unmarshal(data []byte) error {
+	m := new(session.SessionToken_Body_TokenLifetime)
+	if err := goproto.Unmarshal(data, m); err != nil {
+		return err
+	}
+
+	*l = *TokenLifetimeFromGRPCMessage(m)
+
+	return nil
+}
+
 func (c *ObjectSessionContext) StableMarshal(buf []byte) ([]byte, error) {
 	if c == nil {
 		return []byte{}, nil
diff --git a/v2/session/marshal_test.go b/v2/session/marshal_test.go
index 8fd889e..059aa84 100644
--- a/v2/session/marshal_test.go
+++ b/v2/session/marshal_test.go
@@ -62,16 +62,14 @@ func TestXHeader_StableMarshal(t *testing.T) {
 
 func TestTokenLifetime_StableMarshal(t *testing.T) {
 	lifetimeFrom := generateLifetime(10, 20, 30)
-	transport := new(grpc.SessionToken_Body_TokenLifetime)
 
 	t.Run("non empty", func(t *testing.T) {
 		wire, err := lifetimeFrom.StableMarshal(nil)
 		require.NoError(t, err)
 
-		err = goproto.Unmarshal(wire, transport)
-		require.NoError(t, err)
+		lifetimeTo := new(session.TokenLifetime)
+		require.NoError(t, lifetimeTo.Unmarshal(wire))
 
-		lifetimeTo := session.TokenLifetimeFromGRPCMessage(transport)
 		require.Equal(t, lifetimeFrom, lifetimeTo)
 	})
 }