node app.js

var page = require('webpage').create(),
    url  = 'http://localhost:3000/cookie-demo';

if (!phantom.cookiesEnabled) {
  console.log('Note: cookies not enabled.');
}

page.open(url, function(status) {
  if (status === 'success') {
    console.log('We start with these cookies:');
    phantom.cookies.forEach(function(c) {
      console.info(JSON.stringify(c, undefined, 2));
    });
    phantom.addCookie({
      name: 'jerry',
      value: 'black-and-white',
      domain: 'localhost'
    });

    console.log('Added the "jerry" cookie; how many now? ' +
      phantom.cookies.length);
    
    phantom.deleteCookie('jerry');
    console.log('Deleted the "jerry" cookie; how many now? ' +
      phantom.cookies.length);

    phantom.clearCookies();

    console.log('How many cookies after a clear? ' +
      phantom.cookies.length);

    phantom.exit();    
  } else {
    console.error('Something is wrong!');
    phantom.exit(1);
  }
});

phantomjs --cookies-file=cookie-jar.txt chapter02/recipe02.js

We start with these cookies:
{
 "domain": "localhost",
 "expires": "Thu, 19 Dec 2013 03:04:33 GMT",
 "expiry": 1387422273,
 "httponly": false,
 "name": "rob",
 "path": "/cookie-demo",
 "secure": false,
 "value": "chocolate-chip"
}
{
 "domain": "localhost",
 "expires": "Thu, 19 Dec 2013 03:04:33 GMT",
 "expiry": 1387422273,
 "httponly": false,
 "name": "dave",
 "path": "/cookie-demo",
 "secure": false,
 "value": "oatmeal-raisin"
}
Added the "jerry" cookie; how many now? 3
Deleted the "jerry" cookie; how many now? 2
How many cookies after a clear? 0