Update

app/Providers/RouteServiceProvider.php

@@ -55,8 +55,9 @@ class RouteServiceProvider extends ServiceProvider
 
                     Route::fallback(function () {
                         return response()->json([
-                            'data' => 'ok',
-                        ]);
+                            'errcode' => 404,
+                            'message' => 'Not Found',
+                        ], 404);
                     });
                 });
         });