JsonModelBinder

JsonModelBinder.cs

using System.Web.Mvc;
using Newtonsoft.Json;

    public class JsonModelBinder : DefaultModelBinder
    {
        public override object BindModel(ControllerContext controllerContext, ModelBindingContext bindingContext)
        {
            var providerResult = bindingContext.ValueProvider.GetValue(bindingContext.ModelName);
            var json = providerResult.AttemptedValue;

            if (json == null)
                return null;

            return JsonConvert.DeserializeObject(json, bindingContext.ModelType);
        }
    }