so there is my chrome extension code (not fully but other part is just html and css code):

switch (window.location.hostname) {
    case "www.youtube.com":
        document.head.innerHTML = generateSTYLES();
        document.body.innerHTML = generateHTML("YouTube");
    break
}

So i want to put other website than YouTube, but i don’t to just copy this code as many time as i need to add website. I want to put all the website in a json file and then execute this code for every of them. Can anyone help with doing it in javascript and the json file ? Thanks