Javascript SetCookie GetCookie

function getCookie(key) {

  const arg = key + '=';

  const cookieLength = document.cookie.length;

  let i = 0;

  while (i < cookieLength) {

    const j = i + arg.length;

    if (document.cookie.substring(i, j) === arg) {

      let endString = document.cookie.indexOf(';', j);

      if (endString === -1) {

        endString = document.cookie.length;

      }

      return decodeURIComponent(document.cookie.substring(j, endString));

    }

    i = document.cookie.indexOf(' ', i) + 1;

    if (i === 0) break;

  }

  return null;

}

function setCookie(key, value, expires, domain, path = '/', secure = false) {

  let cookieString = key + '=' + encodeURIComponent(value);

  if (expires !== undefined) {

    const date = new Date();

    date.setTime(date.getTime() + expires * 24 * 60 * 60 * 1000); // expires in days

    cookieString += '; expires=' + date.toUTCString();

  }

  if (path) {

    cookieString += '; path=' + path;

  }

  if (domain) {

    cookieString += '; domain=' + domain;

  }

  if (secure) {

    cookieString += '; secure';

  }

  document.cookie = cookieString;

}