diff --git a/action_create.go b/action_create.go
index c98bf45..8f53290 100644
--- a/action_create.go
+++ b/action_create.go
@@ -63,6 +63,7 @@ func (payload CreateOptions) newDevice() Device {
 	// Get userAgent data
 	osName, osVersion, isMobile := getUserAgentData(payload.UserAgent)
 
+	userID, _ := mongodb.NewIDFromString(payload.UserID)
 	return Device{
 		ID:              mongodb.NewObjectID(),
 		DeviceID:        payload.DeviceID,
@@ -76,7 +77,7 @@ func (payload CreateOptions) newDevice() Device {
 		FCMToken:        payload.FCMToken,
 		Model:           payload.Model,
 		Manufacturer:    payload.Manufacturer,
-		UserID:          payload.UserID,
+		UserID:          userID,
 		IsMobile:        isMobile,
 		AppVersion:      payload.AppVersion,
 	}
diff --git a/action_get_all.go b/action_get_all.go
index 38a3819..70d73ed 100644
--- a/action_get_all.go
+++ b/action_get_all.go
@@ -4,6 +4,7 @@ import (
 	"context"
 
 	"github.com/Selly-Modules/logger"
+	"github.com/Selly-Modules/mongodb"
 	"go.mongodb.org/mongo-driver/bson"
 )
 
@@ -13,8 +14,9 @@ func (s Service) FindAllDevicesByUserID(userID string) []Device {
 		ctx    = context.Background()
 		col    = s.getDeviceCollection()
 		result = make([]Device, 0)
+		id, _  = mongodb.NewIDFromString(userID)
 		cond   = bson.M{
-			"userId": userID,
+			"userId": id,
 		}
 	)
 
diff --git a/action_get_user_id.go b/action_get_user_id.go
index aa0f829..42930bc 100644
--- a/action_get_user_id.go
+++ b/action_get_user_id.go
@@ -27,6 +27,6 @@ func (s Service) GetUserIDByAuthToken(authToken string) (userID string) {
 		return
 	}
 
-	userID = device.UserID
+	userID = device.UserID.Hex()
 	return
 }
diff --git a/model.go b/model.go
index 5a73a5d..68c51f0 100644
--- a/model.go
+++ b/model.go
@@ -17,7 +17,7 @@ type Device struct {
 	Language        string             `bson:"language" json:"language"` // vi, en
 	IsMobile        bool               `bson:"isMobile" json:"isMobile"`
 	LastActivatedAt time.Time          `bson:"lastActivatedAt" json:"lastActivatedAt"`
-	UserID          string             `bson:"userId" json:"userId"`
+	UserID          primitive.ObjectID `bson:"userId" json:"userId"`
 	AuthToken       string             `bson:"authToken" json:"authToken"`
 	FCMToken        string             `bson:"fcmToken" json:"fcmToken"`
 	Model           string             `bson:"model" json:"model"`
diff --git a/validate.go b/validate.go
index aef6e2b..3df02f5 100644
--- a/validate.go
+++ b/validate.go
@@ -4,6 +4,7 @@ import (
 	"errors"
 
 	"github.com/Selly-Modules/logger"
+	"github.com/Selly-Modules/mongodb"
 )
 
 func (co CreateOptions) validate() error {
@@ -38,6 +39,9 @@ func (co CreateOptions) validate() error {
 		})
 		return errors.New("no userID data")
 	}
+	if _, isValid := mongodb.NewIDFromString(co.UserID); !isValid {
+		return errors.New("invalid userID data")
+	}
 
 	// AuthToken
 	if co.AuthToken == "" {