A simple cookie module, accounts for setting, getting, and removing client-side cookies via JavaScript.

cookies.js

var cookies = {
  /**
   * @param payload {object}
   * @param payload.cookieName {string}
   * @param payload.cookieValue {string}
   * @param payload.days {=Number} - number of days before cookie expires
   * @param payload.sameSite {=string} sameSite setting, default to "None" if not provided
   * @param payload.secure {=Boolean} default to not secure
   */
  set: function (payload) {
    var cookieDomain = document.location.hostname.split(".").slice(-2).join("."),
      protocol = document.location.protocol,
      sameSite = (payload.sameSite) ? payload.sameSite : "None",
      isSecure = payload.secure ? payload.secure : ((sameSite === "None" && /^https/i.test(protocol)) ? "secure" : ""),
      // isSecure = payload.secure ? payload.secure : (sameSite === "None") ? "secure" : "",
      d = new Date;

    d.setTime(d.getTime() + 24 * 60 * 60 * 1000 * payload.days);
    document.cookie = payload.cookieName + "=" + payload.cookieValue + ";path=/;domain=" + cookieDomain + ";expires=" + d.toGMTString() + ";SameSite=" + sameSite + ";" + isSecure;
  },

  /**
   * @param cookieName {string}
   */
  get: function (cookieName) {
    var v = document.cookie.match('(^|;) ?' + cookieName + '=([^;]*)(;|$)');
    return v ? v[2] : null;
  },

  /**
   * @param cookieName {string}
   */
  remove: function (cookieName) {
    this.set({
      cookieName: cookieName,
      cookieValue: "",
      days: -1
    });
  }
};

Last update includes handling options for setting secure cookies based on value of sameSite and protocol if not otherwise specified.