Vanilla javascript cookie utils

cookie.js

const getCookie = (key) => {
  const keyDecoded = decodeURIComponent(key);
  const full = document.cookie
    .split(';')
    .map((v) => v.trim())
    .find((v) => {
      const [name] = v.split('=');
      return name === keyDecoded;
    });

  if (typeof full !== 'undefined') {
    const keyVal = full.split('=');

    if (keyVal.length >= 2) {
      return decodeURIComponent(keyVal[1]);
    }
  }

  return null;
};

const setCookie = (key, value, days = null) => {
  let expires = '';

  if (days !== null) {
    const expiresDate = new Date();
    expiresDate.setDate(expiresDate.getDate() + days);
    expires = `; expires=${expiresDate.toUTCString()}`;
  }

  document.cookie = `${encodeURIComponent(key)}=${encodeURIComponent(value)}${expires}`;
};