You can use :
jQuery.parseJSON( json ) Link to jQuery Documentaion
parsedObject =jQuery.parseJSON( '{"url":"http:\/\/darksilverflame.deviantart.com","content":"Copyright 2012 *DarkSilverflame","description":null,"title":null}');
or form Chrome (F12 -> Console then test the folowing)
a = JSON.parse('{"url":"http:\/\/darksilverflame.deviantart.com","content":"Copyright 2012 *DarkSilverflame","description":null,"title":null}');
I hope that helps.