diff --git a/jetstream_pubsub.go b/jetstream_pubsub.go
index c0c2e9c..6569abc 100644
--- a/jetstream_pubsub.go
+++ b/jetstream_pubsub.go
@@ -14,7 +14,7 @@ func (js JetStream) Publish(subject string, payload []byte) error {
 		return errors.New(msg)
 	}
 
-	if js.debug {
+	if js.cfg.Debug {
 		fmt.Printf("[natsio.JetStream] published a message to subject #%s \n", subject)
 	}
 
@@ -29,7 +29,7 @@ func (js JetStream) Subscribe(subject string, cb nats.MsgHandler) (*nats.Subscri
 		return nil, errors.New(msg)
 	}
 
-	if js.debug {
+	if js.cfg.Debug {
 		fmt.Printf("[natsio.JetStream] subscribe new message from subject #%s \n", subject)
 	}
 
@@ -51,7 +51,7 @@ func (js JetStream) PullSubscribe(subject, consumer string) (*nats.Subscription,
 		return nil, errors.New(msg)
 	}
 
-	if js.debug {
+	if js.cfg.Debug {
 		fmt.Printf("[natsio.JetStream] pull subscribe new message from subject #%s \n", subject)
 	}
 
diff --git a/jetstream_queue.go b/jetstream_queue.go
index abcd581..1708378 100644
--- a/jetstream_queue.go
+++ b/jetstream_queue.go
@@ -15,7 +15,7 @@ func (js JetStream) QueueSubscribe(subject, queueName string, cb nats.MsgHandler
 		return errors.New(msg)
 	}
 
-	if js.debug {
+	if js.cfg.Debug {
 		fmt.Printf("[natsio.JetStream] queue subscribe new message from subject #%s \n", subject)
 	}
 
diff --git a/natsio.go b/natsio.go
index c379e80..17df5e0 100644
--- a/natsio.go
+++ b/natsio.go
@@ -10,20 +10,19 @@ import (
 // Server ...
 type Server struct {
 	instance *nats.Conn
-	debug    bool
+	cfg      Config
 }
 
 // JetStream ...
 type JetStream struct {
 	instance   nats.JetStreamContext
-	debug      bool
+	cfg        Config
 	streamName string
 }
 
 var (
 	natsServer    Server
 	natsJetStream JetStream
-	globalConfig  Config
 )
 
 // Connect ...
@@ -55,7 +54,7 @@ func Connect(cfg Config) (*Server, *JetStream, error) {
 
 	// set client
 	natsServer.instance = nc
-	natsServer.debug = cfg.Debug
+	natsServer.cfg = cfg
 
 	// create jet stream context
 	js, err := nc.JetStream(nats.PublishAsyncMaxPending(256))
@@ -64,11 +63,11 @@ func Connect(cfg Config) (*Server, *JetStream, error) {
 		return nil, nil, errors.New(msg)
 	}
 	natsJetStream.instance = js
-	natsJetStream.debug = cfg.Debug
+	natsJetStream.cfg = cfg
 	natsJetStream.streamName = cfg.StreamName
 
-	// assign client type
-	globalConfig = cfg
+	// add stream
+	natsJetStream.addStream()
 
 	fmt.Printf("⚡️[natsio]: connected to %s \n", cfg.URL)
 
diff --git a/server_reqres.go b/server_reqres.go
index 8cfb871..72c2325 100644
--- a/server_reqres.go
+++ b/server_reqres.go
@@ -14,13 +14,13 @@ const requestTimeout = 10 * time.Second
 // Request ...
 func (s Server) Request(subject string, payload []byte) (*nats.Msg, error) {
 	timeout := requestTimeout
-	if globalConfig.RequestTimeout > 0 {
-		timeout = globalConfig.RequestTimeout
+	if s.cfg.RequestTimeout > 0 {
+		timeout = s.cfg.RequestTimeout
 	}
 	msg, err := s.instance.Request(subject, payload, timeout)
 	if errors.Is(err, nats.ErrNoResponders) {
 		fmt.Printf("[natsio.Server] no responders for subject: %s \n", subject)
-	} else if s.debug {
+	} else if s.cfg.Debug {
 		fmt.Printf("[natsio.Server] send request to subject #%s successfully \n", subject)
 	}
 
diff --git a/utils.go b/utils.go
index 229ed1e..f04c363 100644
--- a/utils.go
+++ b/utils.go
@@ -21,15 +21,13 @@ func combineStreamAndSubjectName(stream, subject string) string {
 }
 
 // GenerateJetStreamSubject ...
-// GenerateJetStreamSubject("admin", "help_center", "get_ticket_by_id")
-func GenerateJetStreamSubject(server, service, subject string) string {
-	return fmt.Sprintf("%s.jetstream.%s.%s.%s", globalConfig.StreamName, server, service, subject)
+func GenerateJetStreamSubject(stream, server, service, subject string) string {
+	return fmt.Sprintf("%s.jetstream.%s.%s.%s", stream, server, service, subject)
 }
 
 // GenerateReqrepSubject ...
-// GenerateReqrepSubject("admin", "help_center", "get_ticket_by_id")
-func GenerateReqrepSubject(server, service, subject string) string {
-	return fmt.Sprintf("%s.reqrep.%s.%s.%s", globalConfig.StreamName, server, service, subject)
+func GenerateReqrepSubject(stream, server, service, subject string) string {
+	return fmt.Sprintf("%s.reqrep.%s.%s.%s", stream, server, service, subject)
 }
 
 // InterfaceToBytes ...