Cookie Monster is a simple JS cookie manager.

CookieMonster.js

/**
 * CookieMonster.JS
 * 
 * @copyright Claude Adrian, CodeAngry
 * @license http://www.wtfpl.net/
 */

;(function(){
	if (typeof String.prototype.trimLeft !== 'function') {
	    String.prototype.trimLeft = function() {
	        return this.replace(/^\s+/, '');
	    };
	}
	if (typeof String.prototype.trimRight !== 'function') {
	    String.prototype.trimRight = function() {
	        return this.replace(/\s+$/, '');
	    };
	}
	if (typeof String.prototype.trim !== 'function') {
	    String.prototype.trim = function() {
	        return this.trimLeft().trimRight();
	    };
	}
})();

/**
 * Exposed methods:
 * 
 * document.cookies.refresh();
 * document.cookies.count();
 * document.cookies.clear();
 * document.cookies.name(name_or_index);
 * document.cookies.value(name_or_index);
 * document.cookies.find(name_or_index);
 * document.cookies.is(name_or_index);
 * document.cookies.get(name_or_index);
 * document.cookies.set(name, value, expires, path, domain, secure);
 * document.cookies.unset(name, path, domain, secure, refresh);
 */
;(function(window, document, undefined){
	// Make object publicly accessible.
	document.cookies = window.cookies = ({
		/* ------------------------- PROPERTIES ------------------------- */
		
		// Store current url information
		url: {},

		// Store names of cookies
		names: [],

		// Store values of cookies
		values: [],

		// Store values of cookies
		pairs: {},

		/* ------------------------- METHODS ------------------------- */

		// Cookie count
		count: function(){
			return this.pairs.length;
		},

		// Name of cookie by index
		name: function(name_or_index){
			if(typeof name_or_index === 'string'){
				name_or_index = name_or_index.trim();
				if(RegExp('^[0-9]+$').test(name_or_index)){
					name_or_index = parseInt(name_or_index);
				}else{
					if(!name_or_index.length){
						return -1;
					}
					return this.name(this.find(name_or_index));
				}
			}

			if(typeof name_or_index === 'number'){
				name_or_index = parseInt(name_or_index);
				if(name_or_index < 0 || name_or_index >= this.count()){
					return null;
				}
				return this.names[name_or_index];
			}

			return null;
		},

		// Value of cookie by index
		value: function(name_or_index){
			if(typeof name_or_index === 'string'){
				name_or_index = name_or_index.trim();
				if(RegExp('^[0-9]+$').test(name_or_index)){
					name_or_index = parseInt(name_or_index);
				}else{
					if(!name_or_index.length){
						return -1;
					}
					return value(find(this.find(name_or_index)));
				}
			}

			if(typeof name_or_index === 'number'){
				name_or_index = parseInt(name_or_index);
				if(name_or_index < 0 || name_or_index >= this.count()){
					return null;
				}
				return this.values[name_or_index];
			}
			
			return null;
		},

		// Find index of a cookie
		find: function(name_or_index){
			if(typeof name_or_index === 'string'){
				name_or_index = name_or_index.trim();
				if(RegExp('^[0-9]+$').test(name_or_index)){
					name_or_index = parseInt(name_or_index);
				}else{
					if(!name_or_index.length){
						return -1;
					}

					for(var pos = 0; pos < this.names.length; pos++){
						var cookieName = this.names[pos];
						if(cookieName.toLowerCase() == name_or_index.toLowerCase()){
							return pos;
						}
					}
					return -1;
				}
			}

			if(typeof name_or_index === 'number'){
				name_or_index = parseInt(name_or_index);
				if(name_or_index < 0 || name_or_index >= this.count()){
					return -1;
				}
				return name_or_index;
			}
			
			return -1;
		},

		// Cookie exists?
		is: function(name_or_index){
			return find(name_or_index) != -1;
		},

		// Drop all cookies, won't work for HTTP only
		clear: function(){
			for(var key in this.names){
				this.unset(this.names[key]);
			}
			return this.refresh();
		},

		// Drop a cookie
		unset: function(name, path, domain, secure, refresh){
			if(typeof name !== 'string'){
				return false;
			}
			name = name.trim();
			if(!name.length){
				return false;
			}

			if(typeof path === 'undefined'){
				path = '/';
			}
			if(typeof domain === 'undefined'){
				domain = document.location.hostname;
			}
			if(typeof refresh === 'undefined'){
				refresh = true;
			}
			if(typeof secure === 'undefined'){
				secure = (document.location.protocol === 'https:');
			}
			
			if(typeof path !== 'string' || !path.length){
				path = '/';
			}

			document.cookie = name + "=" +
				((path) ? ";path=" + path : '') +
				((domain) ? ";domain=" + domain : '') +
				";max-age=-1; expires=Thu, 01-Jan-1970 00:00:01 GMT" +
				((secure) ? ";secure" : '');
			
			if(refresh){
				this.refresh();
			}
			return true;
		},

		// Get cookie value
		get: function(name_or_index){
			var index = this.find(name_or_index);
			return (index == -1) ? null : this.values[index];
		},

		// Set a cookie, update old or create new
		set: function(name, value, expires, path, domain, secure){
			if(typeof name !== 'string'){
				return false;
			}
			name = name.trim();
			if(!name.length){
				return false;
			}

			if(typeof path === 'undefined'){
				path = '/';
			}
			if(typeof domain === 'undefined'){
				domain = document.location.hostname;
			}
			if(typeof secure === 'undefined'){
				secure = (document.location.protocol === 'https:');
			}
			
			if (value === null) {
				return this.unset(name, path, domain);
			}
			if(typeof value === 'undefined'){
				return false;
			}
			
			if(path === null){
				path = document.location.pathname;
			}
			if(domain === null){
				domain = document.location.hostname;
			}
			
			if(typeof path !== 'string'){
				return false;
			}
			if(typeof domain !== 'string'){
				return false;
			}

			if(!path.length){
				path = document.location.pathname;
			}else if(path === '?'){
				path = document.location.pathname + document.location.search;
			}
			if(!domain.length){
				domain = document.location.hostname;
			}


			var components = [];
			components.push(name + '=' + encodeURIComponent(value));
			
			if(expires){
				var seconds = 0;
				
				var date = null;
				if(expires instanceof Date){
					seconds = parseInt((Date().getTime() - expires.getTime()) / 1000);
				}else if(typeof expires === 'number'){
					seconds = expires;
				}else if(typeof expires === 'string'){
					if(RegExp('^[0-9]+$').test(expires)){
						seconds = parseInt(expires);
					}else{
						var matches = RegExp('^([\\+\\-])\\s*([0-9]*\\.[0-9]*)\\s*' +
							'(second|minute|hour|day|week|month|year)s?$', 'i').exec(expires);
						if(matches){
							date = new Date();
							var sign = matches[1], offset = parseFloat(matches[2]), unit = matches[3];
							if(sign === '-'){
								offset = - offset;
							}
							if(unit === 'second'){
								seconds = offset;
							}else if(unit === 'minute'){
								seconds = offset * 60;
							}else if(unit === 'hour'){
								seconds = offset * 60 * 60;
							}else if(unit === 'day'){
								seconds = offset * 24 * 60 * 60;
							}else if(unit === 'week'){
								seconds = offset * 7 * 24 * 60 * 60;
							}
						}
					}
				}else{
					return false;
				}
				if(seconds = parseInt(seconds)){
					components.push('max-age=' + seconds);
					var date = new Date();
					date.setTime(date.getTime() + (seconds * 1000));
					components.push('expires=' + date.toUTCString());
				}
			}
			
			if((typeof path === 'string') && path.length){
				components.push('path=' + path);
			}
			if((typeof domain === 'string') && domain.length){
				components.push('domain=' + domain);
			}
			if(secure){
				components.push('secure');
			}

			document.cookie = components.join(';');
			this.refresh();
			return true;
		},

		// Refresh internal cookie arrays
		refresh: function(){
			this.url.query = document.location.search;
			this.url.path = document.location.pathname;
			this.url.pathqs = this.url.path + this.url.query;
			this.url.url = document.location.href;
			this.url.urlqs = this.url.url + this.url.query;
			this.url.host = document.location.hostname;
			this.url.port = document.location.port;
			this.url.hostport = document.location.host;
			this.url.proto = document.location.protocol;
			this.url.hash = this.url.target = document.location.hash;

			this.names = [];
			this.values = [];
			this.pairs = {};
			
			var documentCookies = document.cookie.split(';');
			for(var pos = 0; pos < documentCookies.length; pos++){
				var documentCookie = documentCookies[pos].trim();
				var cookieParts = documentCookie.split('=', 2);
				if(cookieParts.length != 2){
					continue;
				}
				var cookieName = decodeURIComponent(cookieParts[0].trim());
				var cookieValue = decodeURIComponent(cookieParts[1].trim());
				this.names.push(cookieName);
				this.values.push(cookieValue);
				this.pairs[cookieName] = cookieValue;
			}
			return this;
		}
	}).refresh();
})(window, document, undefined);