Validating Model, global filter attribute - https://codingblast.com/asp-net-core-global-model-validation/

ValidateModelFilter.cs

public class ValidateModelFilter : ActionFilterAttribute
{
    public override void OnActionExecuting(ActionExecutingContext context)
    {
        if (!context.ModelState.IsValid)
        {
            context.Result = new BadRequestObjectResult(context.ModelState);
        }
    }
}