Originally posted on: http://geekswithblogs.net/MightyZot/archive/2013/11/11/javascript-json-error-while-tabbing-in-asp.net-mvc.aspx

I sometimes don’t care about validation for a specific control. The RememberMe control in the login form, for example, really doesn’t need validation, so I forget to include the Html.ValidationMessageFor helper line for that control in particular. As a result, when I’m debugging using IE, I get a silly JSON parsing exception when changing focus from one field to another. The exception doesn’t hurt anything, as far as I know, but it’s just plain annoying. If you’re getting this error, and you don’t want validation messages showing up for controls on a form, you can put them in div tags and set the display style on the divs to none. When I have a handful of controls that I don’t want the validation messages for, I just throw them all in the same div and hide it.