diff --git a/internal/auth/errors.go b/internal/auth/errors.go
new file mode 100644
index 0000000..169c1e0
--- /dev/null
+++ b/internal/auth/errors.go
@@ -0,0 +1,13 @@
+package auth
+
+import "fmt"
+
+var (
+	ErrUserNotFound    = fmt.Errorf("user not found")
+	ErrInvalidPassword = fmt.Errorf("invalid password")
+	ErrInvalidEmail    = fmt.Errorf("invalid email")
+	ErrInvalidUsername = fmt.Errorf("invalid username")
+
+	ErrTokenIsMissing = fmt.Errorf("token is missing")
+	ErrInvalidToken   = fmt.Errorf("invalid token")
+)