I am using this jquery.cookie plugin and I need to set value to TRUE or NULL/FALSE.
I am trying to do it like this: $.cookie('ff', true, { expires: 30, path: '/' });
but it sets the value to string and not boolean.
Any ways of fixing this?
Cookies are only string-valued. As gdoron commented, if you want to treat the value as a boolean, you need to parse it back to a boolean when the cookie value is read back out.
Since you commented that you are reading the cookie value with PHP, see Parsing a string into a boolean value in PHP.