validation request

This output is being generated in the app/Exceptions/Handler.php class in the render method. This render method class the parent method that handles the display of all exceptions in Laravel. In this case, it's a ValidationException which has its own output.

In your case, you can simply override the invalidJson method

// app/Exceptions/Handler.php

class Handler extends ExceptionHandler
{
    // Other methods

    protected function invalidJson($request, ValidationException $exception)
    {
        return response()->json([
            'success' => false,
            'message' => $exception->getMessage(),
            'errors' => $exception->errors(),
        ], $exception->status);
    }
}

thanks