Resources: Joomla!
Login to your front-end without creating a login page
27 September 2012
Login to your website’s frontend quickly and easily, without having to create a custom menu item by using this nifty URL. Super-handy for previewing pages and menu items that are not viewable to ‘Public’.
Just drop it in at the root of your site (ie. http://mysite.co.nz/index.php?option=com_user&view=login) and you will have your login form. Just use your administrator username/password.
index.php?option=com_user&view=login