auth-with-cookie.js

// use a cookie library if one is installed - if not, include getCookieValue()
function getCookieValue(name) {
  let matches = document.cookie.match(new RegExp(
    "(?:^|; )" + name.replace(/([\.$?*|{}\(\)\[\]\\\/\+^])/g, '\\$1') + "=([^;]*)"
  ));
  return matches ? decodeURIComponent(matches[1]) : undefined;
}

// in the React component
useEffect(() => {
  const mwCrawl = getCookieValue('MIRRORWEB_AUTH'); // Replace 'myCookieName' with your cookie's name

  if(mwCrawl !== undefined) {
    // unlock the page content
  }

}, []);