diff --git a/go.mod b/go.mod
index 9cae12d..6575feb 100644
--- a/go.mod
+++ b/go.mod
@@ -4,6 +4,6 @@ go 1.16
 
 require (
 	github.com/segmentio/encoding v0.2.21
-	github.com/unistack-org/micro/v3 v3.7.1
+	github.com/unistack-org/micro/v3 v3.7.4
 	google.golang.org/protobuf v1.27.1
 )
diff --git a/go.sum b/go.sum
index 8f67d20..d978e83 100644
--- a/go.sum
+++ b/go.sum
@@ -1,4 +1,3 @@
-github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/ef-ds/deque v1.0.4/go.mod h1:gXDnTC3yqvBcHbq2lcExjtAcVrOnJCbMcZXmuj8Z4tg=
 github.com/golang-jwt/jwt/v4 v4.0.0/go.mod h1:/xlHOz8bRuivTWchD4jCa+NbatV+wEUSzwAxVc6locg=
 github.com/golang/protobuf v1.5.0/go.mod h1:FsONVRAS9T7sI+LIUmWTfcYkHO4aIWwzhcaSAoJOfIk=
@@ -8,18 +7,15 @@ github.com/imdario/mergo v0.3.12/go.mod h1:jmQim1M+e3UYxmgPu/WyfjB3N3VflVyUjjjwH
 github.com/klauspost/cpuid/v2 v2.0.6 h1:dQ5ueTiftKxp0gyjKSx5+8BtPWkyQbd95m8Gys/RarI=
 github.com/klauspost/cpuid/v2 v2.0.6/go.mod h1:FInQzS24/EEf25PyTYn52gqo7WaD8xa0213Md/qVLRg=
 github.com/patrickmn/go-cache v2.1.0+incompatible/go.mod h1:3Qf8kWWT7OJRJbdiICTKqZju1ZixQ/KpMGzzAfe6+WQ=
-github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
 github.com/segmentio/asm v1.0.1 h1:g9VK62hXylgXI4yJV+dLTu/1j7kTxG9bkUSYBxL9dpg=
 github.com/segmentio/asm v1.0.1/go.mod h1:4EUJGaKsB8ImLUwOGORVsNd9vTRDeh44JGsY4aKp5I4=
 github.com/segmentio/encoding v0.2.21 h1:hlRQz3Pv+/mBj+jqr46TVqqv6AuTwvP5aAxQ0Usd4gY=
 github.com/segmentio/encoding v0.2.21/go.mod h1:kF1db1oBuYxMvLR3RXrZJchRdBKrS+1J/hL63p5hekI=
 github.com/silas/dag v0.0.0-20210121180416-41cf55125c34/go.mod h1:7RTUFBdIRC9nZ7/3RyRNH1bdqIShrDejd1YbLwgPS+I=
-github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
-github.com/stretchr/testify v1.7.0/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg=
 github.com/unistack-org/micro-proto v0.0.9 h1:KrWLS4FUX7UAWNAilQf70uad6ZPf/0EudeddCXllRVc=
 github.com/unistack-org/micro-proto v0.0.9/go.mod h1:Cckwmzd89gvS7ThxzZp9kQR/EOdksFQcsTAtDDyKwrg=
-github.com/unistack-org/micro/v3 v3.7.1 h1:gjCon1U8i9upNgw9+iEgbZh2LCeBizDYotQ+THHV0lo=
-github.com/unistack-org/micro/v3 v3.7.1/go.mod h1:gBoY6gvzeFiJTZ4FgDttGNSs4Y1+1PRg2cV1yTRMSlg=
+github.com/unistack-org/micro/v3 v3.7.4 h1:nRk7f58v0VsiW7aKL0UQaFCQxFoursHQLoWdeZ1RYbg=
+github.com/unistack-org/micro/v3 v3.7.4/go.mod h1:78vy7ggElJD+ayx8ruhJsY+SkGUupfR32LXrg1UObvg=
 golang.org/x/net v0.0.0-20210510120150-4163338589ed/go.mod h1:9nx3DQGgdP8bBQD5qxJ1jj9UTztislL4KSBs9R2vV5Y=
 golang.org/x/sys v0.0.0-20201119102817-f84b799fce68/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20210423082822-04245dca01da/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
@@ -33,4 +29,3 @@ google.golang.org/protobuf v1.27.1 h1:SnqbnDw1V7RiZcXPx5MEeqPv2s79L9i7BJUlG/+Rur
 google.golang.org/protobuf v1.27.1/go.mod h1:9q0QmTI4eRPtz6boOQmLYwt+qCgq0jsYwAQnmE0givc=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/yaml.v2 v2.3.0/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
-gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
diff --git a/json/codec_test.go b/json/codec_test.go
index 6f3efa0..cea01e5 100644
--- a/json/codec_test.go
+++ b/json/codec_test.go
@@ -3,8 +3,40 @@ package json
 import (
 	"bytes"
 	"testing"
+
+	"github.com/unistack-org/micro/v3/codec"
 )
 
+func TestFrame(t *testing.T) {
+	s := &codec.Frame{Data: []byte("test")}
+
+	buf, err := NewCodec().Marshal(s)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if !bytes.Equal(buf, []byte(`test`)) {
+		t.Fatalf("bytes not equal %s != %s", buf, `test`)
+	}
+}
+
+func TestFrameFlatten(t *testing.T) {
+	s := &struct {
+		One  string
+		Name *codec.Frame `json:"name" codec:"flatten"`
+	}{
+		One:  "xx",
+		Name: &codec.Frame{Data: []byte("test")},
+	}
+
+	buf, err := NewCodec().Marshal(s)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if !bytes.Equal(buf, []byte(`test`)) {
+		t.Fatalf("bytes not equal %s != %s", buf, `test`)
+	}
+}
+
 func TestReadBody(t *testing.T) {
 	s := &struct {
 		Name string
diff --git a/json/json.go b/json/json.go
index 8982a59..d07b671 100644
--- a/json/json.go
+++ b/json/json.go
@@ -10,24 +10,29 @@ import (
 )
 
 var (
-	JsonMarshaler = &Marshaler{}
+	DefaultMarshalOptions = JsonMarshalOptions{
+		EscapeHTML:  true,
+		SortMapKeys: true,
+	}
 
-	JsonUnmarshaler = &Unmarshaler{
+	DefaultUnmarshalOptions = JsonUnmarshalOptions{
 		ZeroCopy: true,
 	}
 )
 
+var _ codec.Codec = &jsonCodec{}
+
 const (
 	flattenTag = "flatten"
 )
 
-type Marshaler struct {
+type JsonMarshalOptions struct {
 	EscapeHTML      bool
 	SortMapKeys     bool
 	TrustRawMessage bool
 }
 
-type Unmarshaler struct {
+type JsonUnmarshalOptions struct {
 	DisallowUnknownFields                bool
 	DontCopyNumber                       bool
 	DontCopyRawMessage                   bool
@@ -38,44 +43,121 @@ type Unmarshaler struct {
 }
 
 type jsonCodec struct {
+	opts        codec.Options
 	encodeFlags json.AppendFlags
 	decodeFlags json.ParseFlags
 }
 
-func (c *jsonCodec) Marshal(v interface{}) ([]byte, error) {
-	switch m := v.(type) {
-	case nil:
+func getMarshalFlags(o JsonMarshalOptions) json.AppendFlags {
+	var encodeFlags json.AppendFlags
+
+	if o.EscapeHTML {
+		encodeFlags |= json.EscapeHTML
+	}
+
+	if o.SortMapKeys {
+		encodeFlags |= json.SortMapKeys
+	}
+
+	if o.TrustRawMessage {
+		encodeFlags |= json.TrustRawMessage
+	}
+
+	return encodeFlags
+}
+
+func getUnmarshalFlags(o JsonUnmarshalOptions) json.ParseFlags {
+	var decodeFlags json.ParseFlags
+
+	if o.DisallowUnknownFields {
+		decodeFlags |= json.DisallowUnknownFields
+	}
+
+	if o.DontCopyNumber {
+		decodeFlags |= json.DontCopyNumber
+	}
+
+	if o.DontCopyRawMessage {
+		decodeFlags |= json.DontCopyRawMessage
+	}
+
+	if o.DontCopyString {
+		decodeFlags |= json.DontCopyString
+	}
+
+	if o.DontMatchCaseInsensitiveStructFields {
+		decodeFlags |= json.DontMatchCaseInsensitiveStructFields
+	}
+
+	if o.UseNumber {
+		decodeFlags |= json.UseNumber
+	}
+
+	if o.ZeroCopy {
+		decodeFlags |= json.ZeroCopy
+	}
+
+	return decodeFlags
+}
+
+func (c *jsonCodec) Marshal(v interface{}, opts ...codec.Option) ([]byte, error) {
+	if v == nil {
 		return nil, nil
-	case *codec.Frame:
+	}
+
+	options := c.opts
+	for _, o := range opts {
+		o(&options)
+	}
+
+	if nv, err := rutil.StructFieldByTag(v, options.TagName, flattenTag); err == nil {
+		v = nv
+	}
+
+	if m, ok := v.(*codec.Frame); ok {
 		return m.Data, nil
 	}
 
-	if nv, nerr := rutil.StructFieldByTag(v, codec.DefaultTagName, flattenTag); nerr == nil {
-		v = nv
+	marshalOptions := DefaultMarshalOptions
+	if options.Context != nil {
+		if f, ok := options.Context.Value(marshalOptionsKey{}).(JsonMarshalOptions); ok {
+			marshalOptions = f
+		}
 	}
 
 	var err error
 	var buf []byte
-	buf, err = json.Append(buf, v, c.encodeFlags)
+	buf, err = json.Append(buf, v, getMarshalFlags(marshalOptions))
 	return buf, err
 }
 
-func (c *jsonCodec) Unmarshal(b []byte, v interface{}) error {
-	if len(b) == 0 {
+func (c *jsonCodec) Unmarshal(b []byte, v interface{}, opts ...codec.Option) error {
+	if len(b) == 0 || v == nil {
 		return nil
 	}
-	switch m := v.(type) {
-	case nil:
-		return nil
-	case *codec.Frame:
+
+	options := c.opts
+	for _, o := range opts {
+		o(&options)
+	}
+
+	if nv, err := rutil.StructFieldByTag(v, options.TagName, flattenTag); err == nil {
+		v = nv
+	}
+
+	if m, ok := v.(*codec.Frame); ok {
 		m.Data = b
 		return nil
 	}
 
-	if nv, nerr := rutil.StructFieldByTag(v, codec.DefaultTagName, flattenTag); nerr == nil {
-		v = nv
+	unmarshalOptions := DefaultUnmarshalOptions
+	if options.Context != nil {
+		if f, ok := options.Context.Value(unmarshalOptionsKey{}).(JsonUnmarshalOptions); ok {
+			unmarshalOptions = f
+		}
 	}
-	_, err := json.Parse(b, v, c.decodeFlags)
+
+	_, err := json.Parse(b, v, getUnmarshalFlags(unmarshalOptions))
 	return err
 }
 
@@ -117,49 +199,6 @@ func (c *jsonCodec) String() string {
 	return "json"
 }
 
-func NewCodec() codec.Codec {
-	var encodeFlags json.AppendFlags
-	var decodeFlags json.ParseFlags
-
-	if JsonMarshaler.EscapeHTML {
-		encodeFlags |= json.EscapeHTML
-	}
-
-	if JsonMarshaler.SortMapKeys {
-		encodeFlags |= json.SortMapKeys
-	}
-
-	if JsonMarshaler.TrustRawMessage {
-		encodeFlags |= json.TrustRawMessage
-	}
-
-	if JsonUnmarshaler.DisallowUnknownFields {
-		decodeFlags |= json.DisallowUnknownFields
-	}
-
-	if JsonUnmarshaler.DontCopyNumber {
-		decodeFlags |= json.DontCopyNumber
-	}
-
-	if JsonUnmarshaler.DontCopyRawMessage {
-		decodeFlags |= json.DontCopyRawMessage
-	}
-
-	if JsonUnmarshaler.DontCopyString {
-		decodeFlags |= json.DontCopyString
-	}
-
-	if JsonUnmarshaler.DontMatchCaseInsensitiveStructFields {
-		decodeFlags |= json.DontMatchCaseInsensitiveStructFields
-	}
-
-	if JsonUnmarshaler.UseNumber {
-		decodeFlags |= json.UseNumber
-	}
-
-	if JsonUnmarshaler.ZeroCopy {
-		decodeFlags |= json.ZeroCopy
-	}
-
-	return &jsonCodec{encodeFlags: encodeFlags, decodeFlags: decodeFlags}
+func NewCodec(opts ...codec.Option) *jsonCodec {
+	return &jsonCodec{opts: codec.NewOptions(opts...)}
 }
diff --git a/json/options.go b/json/options.go
new file mode 100644
index 0000000..60d3971
--- /dev/null
+++ b/json/options.go
@@ -0,0 +1,17 @@
+package json
+
+import (
+	codec "github.com/unistack-org/micro/v3/codec"
+)
+
+type unmarshalOptionsKey struct{}
+
+func UnmarshalOptions(o JsonUnmarshalOptions) codec.Option {
+	return codec.SetOption(unmarshalOptionsKey{}, o)
+}
+
+type marshalOptionsKey struct{}
+
+func MarshalOptions(o JsonMarshalOptions) codec.Option {
+	return codec.SetOption(marshalOptionsKey{}, o)
+}
diff --git a/proto/codec_test.go b/proto/codec_test.go
index c391d48..944123a 100644
--- a/proto/codec_test.go
+++ b/proto/codec_test.go
@@ -3,8 +3,40 @@ package proto
 import (
 	"bytes"
 	"testing"
+
+	"github.com/unistack-org/micro/v3/codec"
 )
 
+func TestFrame(t *testing.T) {
+	s := &codec.Frame{Data: []byte("test")}
+
+	buf, err := NewCodec().Marshal(s)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if !bytes.Equal(buf, []byte(`test`)) {
+		t.Fatalf("bytes not equal %s != %s", buf, `test`)
+	}
+}
+
+func TestFrameFlatten(t *testing.T) {
+	s := &struct {
+		One  string
+		Name *codec.Frame `json:"name" codec:"flatten"`
+	}{
+		One:  "xx",
+		Name: &codec.Frame{Data: []byte("test")},
+	}
+
+	buf, err := NewCodec().Marshal(s)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if !bytes.Equal(buf, []byte(`test`)) {
+		t.Fatalf("bytes not equal %s != %s", buf, `test`)
+	}
+}
+
 func TestReadBody(t *testing.T) {
 	t.Skip("no proto generated")
 	s := &struct {
diff --git a/proto/proto.go b/proto/proto.go
index f5f2b99..d912616 100644
--- a/proto/proto.go
+++ b/proto/proto.go
@@ -10,52 +10,71 @@ import (
 	newproto "google.golang.org/protobuf/proto"
 )
 
-type protoCodec struct{}
+type protoCodec struct {
+	opts codec.Options
+}
+
+var _ codec.Codec = &protoCodec{}
 
 const (
 	flattenTag = "flatten"
 )
 
-func (c *protoCodec) Marshal(v interface{}) ([]byte, error) {
-	switch m := v.(type) {
-	case nil:
+func (c *protoCodec) Marshal(v interface{}, opts ...codec.Option) ([]byte, error) {
+	if v == nil {
 		return nil, nil
-	case *codec.Frame:
-		return m.Data, nil
-	case newproto.Message, proto.Message:
-		if nv, nerr := rutil.StructFieldByTag(v, codec.DefaultTagName, flattenTag); nerr == nil {
-			if nm, ok := nv.(newproto.Message); ok {
-				m = nm
-			} else if nm, ok := nv.(proto.Message); ok {
-				m = nm
-			}
-		}
-		return proto.Marshal(m)
 	}
-	return nil, codec.ErrInvalidMessage
+
+	options := c.opts
+	for _, o := range opts {
+		o(&options)
+	}
+
+	if nv, nerr := rutil.StructFieldByTag(v, options.TagName, flattenTag); nerr == nil {
+		v = nv
+	}
+
+	if m, ok := v.(*codec.Frame); ok {
+		return m.Data, nil
+	}
+
+	switch v.(type) {
+	case proto.Message, newproto.Message:
+		break
+	default:
+		return nil, codec.ErrInvalidMessage
+	}
+
+	return proto.Marshal(v.(proto.Message))
 }
 
-func (c *protoCodec) Unmarshal(d []byte, v interface{}) error {
-	if d == nil {
+func (c *protoCodec) Unmarshal(d []byte, v interface{}, opts ...codec.Option) error {
+	if v == nil || len(d) == 0 {
 		return nil
 	}
-	switch m := v.(type) {
-	case nil:
-		return nil
-	case *codec.Frame:
+
+	options := c.opts
+	for _, o := range opts {
+		o(&options)
+	}
+
+	if nv, nerr := rutil.StructFieldByTag(v, options.TagName, flattenTag); nerr == nil {
+		v = nv
+	}
+
+	if m, ok := v.(*codec.Frame); ok {
 		m.Data = d
 		return nil
-	case newproto.Message, proto.Message:
-		if nv, nerr := rutil.StructFieldByTag(v, codec.DefaultTagName, flattenTag); nerr == nil {
-			if nm, ok := nv.(newproto.Message); ok {
-				m = nm
-			} else if nm, ok := nv.(proto.Message); ok {
-				m = nm
-			}
-		}
-		return proto.Unmarshal(d, m)
 	}
-	return codec.ErrInvalidMessage
+
+	switch v.(type) {
+	case proto.Message, newproto.Message:
+		break
+	default:
+		return codec.ErrInvalidMessage
+	}
+
+	return proto.Unmarshal(d, v.(proto.Message))
 }
 
 func (c *protoCodec) ReadHeader(conn io.Reader, m *codec.Message, t codec.MessageType) error {
@@ -95,6 +114,6 @@ func (c *protoCodec) String() string {
 	return "proto"
 }
 
-func NewCodec() codec.Codec {
-	return &protoCodec{}
+func NewCodec(opts ...codec.Option) *protoCodec {
+	return &protoCodec{opts: codec.NewOptions(opts...)}
 }