diff --git a/DalTube/DalTube.xcworkspace/xcuserdata/guest1.xcuserdatad/UserInterfaceState.xcuserstate b/DalTube/DalTube.xcworkspace/xcuserdata/guest1.xcuserdatad/UserInterfaceState.xcuserstate
index 49963b9..b559101 100644
Binary files a/DalTube/DalTube.xcworkspace/xcuserdata/guest1.xcuserdatad/UserInterfaceState.xcuserstate and b/DalTube/DalTube.xcworkspace/xcuserdata/guest1.xcuserdatad/UserInterfaceState.xcuserstate differ
diff --git a/DalTube/DalTube/Login/UserSignService.swift b/DalTube/DalTube/Login/UserSignService.swift
index 125b99f..3051354 100644
--- a/DalTube/DalTube/Login/UserSignService.swift
+++ b/DalTube/DalTube/Login/UserSignService.swift
@@ -50,5 +50,10 @@ struct UserSignService {
         }
     }
     
-
+    private func isValidLoginData(data: Data) -> NetworkResult<Any> {
+        let decoder = JSONDecoder()
+        guard let decodedData = try? decoder.decode(LoginResponseData.self, from: data)
+        else {return .pathErr}
+        return .success(decodedData)
+    }
 }