Simple cookie manipulator. (Tip: Use https://github.com/js-cookie/js-cookie instead)

js-cookie.js

/**
 * Copyright (c) 2016 F.W. Dekker
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */

"use strict";


/**
 * Simple utility class for managing cookies.
 */
class Cookie {
    /**
     * Sets a cookie.
     *
     * Can also be used to update a cookie.
     *
     * @param  {string} key      the key
     * @param  {string} value    the value of the cookie
     * @param  {object} options  additional parameters for the cookie. Possible values are "path", "domain", "max_age",
     *                           "expires", and "secure".
     */
    static set(key, value, options) {
        let cookie = key + "=" + value;
        if (options !== undefined) {
            if (options.path !== undefined)
                cookie += ";path=" + options.path;
            if (options.domain !== undefined)
                cookie += ";domain=" + options.domain;
            if (options.max_age !== undefined)
                cookie += ";max-age=" + options.max_age;
            if (options.expires !== undefined)
                cookie += ";expires=" + options.expires;
            if (options.secure === "true")
                cookie += ";secure";
        }

        document.cookie = cookie;
    };

    /**
     * Returns the value of the cookie with the associated key.
     *
     * @param   {string} key  the key of the cookie
     * @return  {(string|undefined)} the value of the cookie with the associated key
     */
    static get(key) {
        const value = "; " + document.cookie;
        const parts = value.split(`; ${key}=`);

        if (parts.length !== 2)
            return undefined;

        return parts.pop().split(";").shift();
    };

    /**
     * Clears a cookie.
     *
     * The value is removed and the cookie will not be sent upon further requests.
     *
     * @param  {string} key  the key of the cookie to be cleared
     */
    static clear(key) {
        Cookie.set(key, "", {expires: "Thu, 01 Jan 1970 00:00:01 GMT"});
    };
}

js-cookie.min.js

/**
 * Copyright (c) 2016 F.W. Dekker
 * 
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 * 
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */
"use strict";class Cookie{static set(key,value,options){let cookie=key+"="+value;if(options!==undefined){if(options.path!==undefined){cookie+=";path="+options.path}if(options.domain!==undefined){cookie+=";domain="+options.domain}if(options.max_age!==undefined){cookie+=";max-age="+options.max_age}if(options.expires!==undefined){cookie+=";expires="+options.expires}if(options.secure==="true"){cookie+=";secure"}}document.cookie=cookie};static get(key){const value="; "+document.cookie;const parts=value.split(`; ${ key }=`);if(parts.length!==2){return undefined}return parts.pop().split(";").shift()};static clear(key){Cookie.set(key,"",{expires:"Thu, 01 Jan 1970 00:00:01 GMT"})}}