Model state validation filter ASP.NET Core

ModelStateValidationFilter.cs

using System;
using Microsoft.AspNetCore.Mvc;
using Microsoft.AspNetCore.Mvc.Filters;

namespace Example
{
    public class ModelStateValidationFilter : Attribute, IActionFilter
    {
        public void OnActionExecuting(ActionExecutingContext context)
        {
            if (!context.ModelState.IsValid) {
                context.Result = new BadRequestObjectResult(context.ModelState);
            }
        }

        public void OnActionExecuted(ActionExecutedContext context) {}
    }
}