Check if httponly cookie exists in Javascript

Question

As the question says can you find out if a cookie exists within Javascript if it is a HttpOnly? I don\'t need to access the information inside of it, just know it has one.

Answer 1

You can indirectly check to see if it exists by trying to set it to a value with javascript if it can't be set, then the HTTP Only Cookie must be there (or the user is blocking cookies).

function doesHttpOnlyCookieExist(cookiename) {
  var d = new Date();
  d.setTime(d.getTime() + (1000));
  var expires = "expires=" + d.toUTCString();

  document.cookie = cookiename + "=new_value;path=/;" + expires;
  if (document.cookie.indexOf(cookiename + '=') == -1) {
    return true;
  } else {
    return false;
  }
}