diff --git a/.gitignore b/.gitignore
index 1801170..8faa316 100644
--- a/.gitignore
+++ b/.gitignore
@@ -7,4 +7,4 @@
 .env
 
 # data
-./data
\ No newline at end of file
+./data/
\ No newline at end of file
diff --git a/internal/service/user.go b/internal/service/user.go
index 6993664..727a27d 100644
--- a/internal/service/user.go
+++ b/internal/service/user.go
@@ -11,7 +11,7 @@ import (
 
 type UserService interface {
 	UserLogin(dto *dto.UserLoginReq) (*dto.UserLoginResp, error)
-	UserRegister(dto *dto.UserRegisterReq) (*dto.UserRegisterResp, error)
+	// TODO impl other user-related methods
 }
 
 type userService struct{}
@@ -28,5 +28,9 @@ func (s *userService) UserLogin(dto *dto.UserLoginReq) (*dto.UserLoginResp, erro
 	if user == nil {
 		return nil, errors.New(resps.ErrNotFound)
 	}
-	utils.Password.VerifyPassword(dto.Password, user.Password, utils.Env.Get(constant.EnvVarPasswordSalt, "default_salt"))
+	if utils.Password.VerifyPassword(dto.Password, user.Password, utils.Env.Get(constant.EnvVarPasswordSalt, "default_salt")) {
+		return nil, nil // TODO: Generate JWT token and return it in the response
+	} else {
+		return nil, errors.New(resps.ErrInvalidCredentials)
+	}
 }
diff --git a/pkg/resps/texts.go b/pkg/resps/texts.go
index 9db607d..4afde10 100644
--- a/pkg/resps/texts.go
+++ b/pkg/resps/texts.go
@@ -5,4 +5,6 @@ const (
 	ErrUnauthorized = "unauthorized access"
 	ErrForbidden    = "access forbidden"
 	ErrNotFound     = "resource not found"
+
+	ErrInvalidCredentials = "invalid credentials"
 )