diff --git a/config.go b/config.go
index 1da9939..d084b3c 100644
--- a/config.go
+++ b/config.go
@@ -1,6 +1,9 @@
 package natsio
 
-import "time"
+import (
+	"errors"
+	"time"
+)
 
 // Config ...
 type Config struct {
@@ -21,6 +24,24 @@ type Config struct {
 
 	// Stream name
 	StreamName string
+
+	// Server
+	Server string
+
+	// Service
+	Service string
+}
+
+func (c Config) validate() error {
+	if c.URL == "" {
+		return errors.New("connect URL is required")
+	}
+
+	if c.Server == "" || c.Service == "" {
+		return errors.New("server and service name is required")
+	}
+
+	return nil
 }
 
 // TLSConfig ...
diff --git a/natsio.go b/natsio.go
index f2375b1..169a675 100644
--- a/natsio.go
+++ b/natsio.go
@@ -10,7 +10,6 @@ import (
 // Server ...
 type Server struct {
 	instance *nats.Conn
-	Config   Config
 }
 
 // JetStream ...
@@ -22,23 +21,25 @@ type JetStream struct {
 var (
 	natsServer    Server
 	natsJetStream JetStream
+	globalConfig  Config
 )
 
 // Connect ...
 func Connect(cfg Config) error {
-	if cfg.URL == "" {
-		return errors.New("connect URL is required")
+	// validate
+	if err := cfg.validate(); err != nil {
+		return err
 	}
 
-	// Connect options
+	// connect options
 	opts := make([]nats.Option, 0)
 
-	// Has authentication
+	// has authentication
 	if cfg.User != "" {
 		opts = append(opts, nats.UserInfo(cfg.User, cfg.Password))
 	}
 
-	// If it has TLS
+	// if it has TLS
 	if cfg.TLS != nil {
 		opts = append(opts, nats.ClientCert(cfg.TLS.CertFilePath, cfg.TLS.KeyFilePath))
 		opts = append(opts, nats.RootCAs(cfg.TLS.RootCAFilePath))
@@ -50,13 +51,10 @@ func Connect(cfg Config) error {
 		return errors.New(msg)
 	}
 
-	fmt.Printf("⚡️[natsio]: connected to %s \n", cfg.URL)
-
-	// Set client
+	// set client
 	natsServer.instance = nc
-	natsServer.Config = cfg
 
-	// Create jet stream context
+	// create jet stream context
 	js, err := nc.JetStream(nats.PublishAsyncMaxPending(256))
 	if err != nil {
 		msg := fmt.Sprintf("error when create NATS JetStream: %s", err.Error())
@@ -65,6 +63,11 @@ func Connect(cfg Config) error {
 	natsJetStream.instance = js
 	natsJetStream.streamName = cfg.StreamName
 
+	// assign client type
+	globalConfig = cfg
+
+	fmt.Printf("⚡️[natsio]: connected to %s \n", cfg.URL)
+
 	return nil
 }
 
diff --git a/server_reqres.go b/server_reqres.go
index 335b4a4..b155b16 100644
--- a/server_reqres.go
+++ b/server_reqres.go
@@ -15,8 +15,8 @@ const requestTimeout = 10 * time.Second
 // Request ...
 func (sv Server) Request(subject string, payload []byte) (*nats.Msg, error) {
 	timeout := requestTimeout
-	if sv.Config.RequestTimeout > 0 {
-		timeout = sv.Config.RequestTimeout
+	if globalConfig.RequestTimeout > 0 {
+		timeout = globalConfig.RequestTimeout
 	}
 	msg, err := sv.instance.Request(subject, payload, timeout)
 	if errors.Is(err, nats.ErrNoResponders) {
diff --git a/utils.go b/utils.go
index 8ffd670..9a8ab42 100644
--- a/utils.go
+++ b/utils.go
@@ -28,3 +28,8 @@ func generateSubjectNames(streamName string, subjects []string) []string {
 func combineStreamAndSubjectName(stream, subject string) string {
 	return fmt.Sprintf("%s.%s", stream, subject)
 }
+
+// GenerateSubjectByClientType ...
+func GenerateSubjectByClientType(subject string) string {
+	return fmt.Sprintf("%s.%s.%s.%s", globalConfig.StreamName, globalConfig.Server, globalConfig.Service, subject)
+}