diff --git a/server/router/api/v1/auth.go b/server/router/api/v1/auth.go
index b07f76361..fca59ee05 100644
--- a/server/router/api/v1/auth.go
+++ b/server/router/api/v1/auth.go
@@ -6,6 +6,7 @@ import (
 	"time"
 
 	"github.com/golang-jwt/jwt/v5"
+	"github.com/pkg/errors"
 
 	"github.com/usememos/memos/internal/util"
 )
@@ -79,12 +80,12 @@ func BuildSessionCookieValue(userID int32, sessionID string) string {
 func ParseSessionCookieValue(cookieValue string) (int32, string, error) {
 	parts := strings.SplitN(cookieValue, "-", 2)
 	if len(parts) != 2 {
-		return 0, "", fmt.Errorf("invalid session cookie format")
+		return 0, "", errors.New("invalid session cookie format")
 	}
 
 	userID, err := util.ConvertStringToInt32(parts[0])
 	if err != nil {
-		return 0, "", fmt.Errorf("invalid user ID in session cookie: %v", err)
+		return 0, "", errors.Errorf("invalid user ID in session cookie: %v", err)
 	}
 
 	return userID, parts[1], nil
diff --git a/server/router/api/v1/auth_service.go b/server/router/api/v1/auth_service.go
index aede7269e..416d02d98 100644
--- a/server/router/api/v1/auth_service.go
+++ b/server/router/api/v1/auth_service.go
@@ -387,7 +387,7 @@ func (s *APIV1Service) trackUserSession(ctx context.Context, userID int32, sessi
 // - DeviceType: "mobile", "tablet", or "desktop"
 // - Os: Operating system name and version (e.g., "iOS 17.1", "Windows 10/11")
 // - Browser: Browser name and version (e.g., "Chrome 120.0.0.0")
-// - Country: Geographic location (TODO: implement with GeoIP service)
+// - Country: Geographic location (TODO: implement with GeoIP service).
 func (s *APIV1Service) extractClientInfo(ctx context.Context) *storepb.SessionsUserSetting_ClientInfo {
 	clientInfo := &storepb.SessionsUserSetting_ClientInfo{}
 
@@ -412,8 +412,8 @@ func (s *APIV1Service) extractClientInfo(ctx context.Context) *storepb.SessionsU
 	return clientInfo
 }
 
-// parseUserAgent extracts device type, OS, and browser information from user agent string
-func (s *APIV1Service) parseUserAgent(userAgent string, clientInfo *storepb.SessionsUserSetting_ClientInfo) {
+// parseUserAgent extracts device type, OS, and browser information from user agent string.
+func (*APIV1Service) parseUserAgent(userAgent string, clientInfo *storepb.SessionsUserSetting_ClientInfo) {
 	if userAgent == "" {
 		return
 	}
@@ -440,7 +440,7 @@ func (s *APIV1Service) parseUserAgent(userAgent string, clientInfo *storepb.Sess
 			versionStart := idx + 7
 			versionEnd := strings.Index(userAgent[versionStart:], " ")
 			if versionEnd != -1 {
-				version := strings.Replace(userAgent[versionStart:versionStart+versionEnd], "_", ".", -1)
+				version := strings.ReplaceAll(userAgent[versionStart:versionStart+versionEnd], "_", ".")
 				clientInfo.Os = "iOS " + version
 			} else {
 				clientInfo.Os = "iOS"
@@ -449,7 +449,7 @@ func (s *APIV1Service) parseUserAgent(userAgent string, clientInfo *storepb.Sess
 			versionStart := idx + 10
 			versionEnd := strings.Index(userAgent[versionStart:], " ")
 			if versionEnd != -1 {
-				version := strings.Replace(userAgent[versionStart:versionStart+versionEnd], "_", ".", -1)
+				version := strings.ReplaceAll(userAgent[versionStart:versionStart+versionEnd], "_", ".")
 				clientInfo.Os = "iOS " + version
 			} else {
 				clientInfo.Os = "iOS"
@@ -491,7 +491,7 @@ func (s *APIV1Service) parseUserAgent(userAgent string, clientInfo *storepb.Sess
 				versionEnd = strings.Index(userAgent[versionStart:], ")")
 			}
 			if versionEnd != -1 {
-				version := strings.Replace(userAgent[versionStart:versionStart+versionEnd], "_", ".", -1)
+				version := strings.ReplaceAll(userAgent[versionStart:versionStart+versionEnd], "_", ".")
 				clientInfo.Os = "macOS " + version
 			} else {
 				clientInfo.Os = "macOS"
diff --git a/server/router/api/v1/auth_service_client_info_test.go b/server/router/api/v1/auth_service_client_info_test.go
index 7f754733f..82429e711 100644
--- a/server/router/api/v1/auth_service_client_info_test.go
+++ b/server/router/api/v1/auth_service_client_info_test.go
@@ -119,7 +119,7 @@ func TestExtractClientInfo(t *testing.T) {
 	}
 }
 
-// TestClientInfoExamples demonstrates the enhanced client info extraction with various user agents
+// TestClientInfoExamples demonstrates the enhanced client info extraction with various user agents.
 func TestClientInfoExamples(t *testing.T) {
 	service := &APIV1Service{}