diff --git a/protocol/json/client.go b/protocol/json/client.go
index 63dfb3c..15e9eb4 100644
--- a/protocol/json/client.go
+++ b/protocol/json/client.go
@@ -8,8 +8,6 @@ import (
 	jsoniter "github.com/json-iterator/go"
 )
 
-var json = jsoniter.ConfigCompatibleWithStandardLibrary
-
 // ----------------------------------------------------------------------------
 // Codec
 // ----------------------------------------------------------------------------
@@ -42,7 +40,7 @@ func (cc *ClientCodec) WriteRequest(w io.Writer, method string, args []interface
 		ID:      id,
 	}
 
-	encoder := json.NewEncoder(cc.codecSel.SelectByWriter(w).Encode(w))
+	encoder := jsoniter.NewEncoder(cc.codecSel.SelectByWriter(w).Encode(w))
 	if err := encoder.Encode(req); nil != err {
 		return err
 	}
diff --git a/protocol/json/client_notification.go b/protocol/json/client_notification.go
index 0065a85..18b4c54 100644
--- a/protocol/json/client_notification.go
+++ b/protocol/json/client_notification.go
@@ -1,14 +1,14 @@
 package json
 
 import (
+	"encoding/json"
+
 	"git.loafle.net/commons_go/rpc/codec"
 	crp "git.loafle.net/commons_go/rpc/protocol"
 	cuej "git.loafle.net/commons_go/util/encoding/json"
 	jsoniter "github.com/json-iterator/go"
 )
 
-var json = jsoniter.ConfigCompatibleWithStandardLibrary
-
 // ----------------------------------------------------------------------------
 // ClientNotificationCodec
 // ----------------------------------------------------------------------------
@@ -56,7 +56,7 @@ func (cnc *ClientNotificationCodec) Params() ([]string, error) {
 	if cnc.err == nil && cnc.noti.Params != nil {
 		var values []string
 
-		if err := json.Unmarshal(*cnc.noti.Params, &values); err != nil {
+		if err := jsoniter.Unmarshal(*cnc.noti.Params, &values); err != nil {
 			cnc.err = &Error{
 				Code:    crp.E_INVALID_REQ,
 				Message: err.Error(),
diff --git a/protocol/json/client_response.go b/protocol/json/client_response.go
index 130c365..c4fd65d 100644
--- a/protocol/json/client_response.go
+++ b/protocol/json/client_response.go
@@ -1,6 +1,7 @@
 package json
 
 import (
+	"encoding/json"
 	"fmt"
 	"io"
 
@@ -10,8 +11,6 @@ import (
 	jsoniter "github.com/json-iterator/go"
 )
 
-var json = jsoniter.ConfigCompatibleWithStandardLibrary
-
 // ----------------------------------------------------------------------------
 // ClientResponseCodec
 // ----------------------------------------------------------------------------
@@ -36,7 +35,7 @@ func (crc *ClientResponseCodec) ID() interface{} {
 
 func (crc *ClientResponseCodec) Result(result interface{}) error {
 	if nil == crc.err && nil != crc.res.Result {
-		if err := json.Unmarshal(*crc.res.Result, result); nil != err {
+		if err := jsoniter.Unmarshal(*crc.res.Result, result); nil != err {
 			crc.err = &Error{
 				Code:    crp.E_PARSE,
 				Message: err.Error(),
@@ -58,7 +57,7 @@ func (crc *ClientResponseCodec) Notification() (protocol.ClientNotificationCodec
 	}
 
 	noti := &clientNotification{}
-	err := json.Unmarshal(*crc.res.Result, noti)
+	err := jsoniter.Unmarshal(*crc.res.Result, noti)
 	if nil != err {
 		return nil, err
 	}
@@ -69,7 +68,7 @@ func (crc *ClientResponseCodec) Notification() (protocol.ClientNotificationCodec
 // newClientMessageCodec returns a new ClientMessageCodec.
 func newClientResponseCodec(r io.Reader, codec codec.Codec) (protocol.ClientResponseCodec, error) {
 
-	decoder := json.NewDecoder(r)
+	decoder := jsoniter.NewDecoder(r)
 	if nil == r {
 		return nil, io.EOF
 	}
diff --git a/protocol/json/constants.go b/protocol/json/constants.go
index b5e4742..524e171 100644
--- a/protocol/json/constants.go
+++ b/protocol/json/constants.go
@@ -1,5 +1,11 @@
 package json
 
+// import (
+// 	jsoniter "github.com/json-iterator/go"
+// )
+
+// var json = jsoniter.ConfigCompatibleWithStandardLibrary
+
 const (
 	Name    = "jsonrpc"
 	Version = "2.0"
diff --git a/protocol/json/server.go b/protocol/json/server.go
index 78d259e..af5135d 100644
--- a/protocol/json/server.go
+++ b/protocol/json/server.go
@@ -1,6 +1,7 @@
 package json
 
 import (
+	"encoding/json"
 	"io"
 
 	"git.loafle.net/commons_go/rpc/codec"
@@ -8,8 +9,6 @@ import (
 	jsoniter "github.com/json-iterator/go"
 )
 
-var json = jsoniter.ConfigCompatibleWithStandardLibrary
-
 var null = json.RawMessage([]byte("null"))
 
 // ----------------------------------------------------------------------------
@@ -46,7 +45,7 @@ func (sc *ServerCodec) WriteNotification(w io.Writer, method string, args []inte
 	noti := &serverNotification{Method: method, Params: params}
 	res := &serverResponse{Version: Version, Result: noti}
 
-	encoder := json.NewEncoder(sc.codecSel.SelectByWriter(w).Encode(w))
+	encoder := jsoniter.NewEncoder(sc.codecSel.SelectByWriter(w).Encode(w))
 	// Not sure in which case will this happen. But seems harmless.
 	if err := encoder.Encode(res); nil != err {
 		return err
diff --git a/protocol/json/server_request.go b/protocol/json/server_request.go
index 865f443..3bec25a 100644
--- a/protocol/json/server_request.go
+++ b/protocol/json/server_request.go
@@ -1,6 +1,7 @@
 package json
 
 import (
+	"encoding/json"
 	"io"
 
 	"git.loafle.net/commons_go/rpc/codec"
@@ -10,8 +11,6 @@ import (
 	jsoniter "github.com/json-iterator/go"
 )
 
-var json = jsoniter.ConfigCompatibleWithStandardLibrary
-
 // ----------------------------------------------------------------------------
 // Request
 // ----------------------------------------------------------------------------
@@ -40,7 +39,7 @@ type serverRequest struct {
 // newRequestCodec returns a new ServerRequestCodec.
 func newServerRequestCodec(r io.Reader, codec codec.Codec) (protocol.ServerRequestCodec, error) {
 	// Decode the request body and check if RPC method is valid.
-	decoder := json.NewDecoder(r)
+	decoder := jsoniter.NewDecoder(r)
 	if nil == r {
 		return nil, io.EOF
 	}
@@ -120,7 +119,7 @@ func (src *ServerRequestCodec) Params() ([]string, error) {
 	if src.err == nil && src.req.Params != nil {
 		var values []string
 
-		if err := json.Unmarshal(*src.req.Params, &values); err != nil {
+		if err := jsoniter.Unmarshal(*src.req.Params, &values); err != nil {
 			src.err = &Error{
 				Code:    crp.E_INVALID_REQ,
 				Message: err.Error(),
@@ -156,7 +155,7 @@ func (src *ServerRequestCodec) WriteError(w io.Writer, status int, err error) er
 func (src *ServerRequestCodec) writeServerResponse(w io.Writer, res *serverResponse) error {
 	// ID is null for notifications and they don't have a response.
 	if src.req.ID != nil {
-		encoder := json.NewEncoder(src.codec.Encode(w))
+		encoder := jsoniter.NewEncoder(src.codec.Encode(w))
 		// Not sure in which case will this happen. But seems harmless.
 		if err := encoder.Encode(res); nil != err {
 			return err
diff --git a/protocol/json/util.go b/protocol/json/util.go
index dd20139..d31ee5d 100644
--- a/protocol/json/util.go
+++ b/protocol/json/util.go
@@ -4,13 +4,10 @@ import (
 	"fmt"
 	"reflect"
 
-	jsoniter "github.com/json-iterator/go"
-
 	cur "git.loafle.net/commons_go/util/reflect"
+	jsoniter "github.com/json-iterator/go"
 )
 
-var json = jsoniter.ConfigCompatibleWithStandardLibrary
-
 func convertParamsToStringArray(params []interface{}) ([]string, error) {
 	var values []string
 	if nil == params || 0 == len(params) {
@@ -23,7 +20,7 @@ func convertParamsToStringArray(params []interface{}) ([]string, error) {
 		case reflect.String:
 			values = append(values, param.(string))
 		case reflect.Array, reflect.Slice, reflect.Map, reflect.Struct:
-			b, err := json.Marshal(param)
+			b, err := jsoniter.Marshal(param)
 			if nil != err {
 				return nil, err
 			}
@@ -32,7 +29,7 @@ func convertParamsToStringArray(params []interface{}) ([]string, error) {
 			if t.Elem().Kind() != reflect.Struct {
 				return nil, fmt.Errorf("Pointer of param[%d] is permitted only Struct type", i)
 			}
-			b, err := json.Marshal(param)
+			b, err := jsoniter.Marshal(param)
 			if nil != err {
 				return nil, err
 			}