How do I delete a cookie from a specific domain using Javascript?

Question

Let\'s say I am at http://www.example.com and I want to delete a cookie whose domain is .example.com and another one whose domain is www.example.com

Answer 1

You could do this only if you were at http://example.com and wanted to delete http://blah.example.com cookie. It wouldn't work from www.example.com either - only the "base" domain can delete subdomain cookies.

There are also "all-subdomain" cookies, which start with a ., and can also only be deleted by the base domain.

From the base domain, this should work to delete it:

document.cookie = 'my_cookie=; path=/; domain=.example.com; expires=' + new Date(0).toUTCString();

Or using the excellent jquery.cookie plugin:

$.cookie('my_cookie',null, {domain:'.example.com'})