Dynamic Page Title.js

<script>
var projectTitle;
var projectTitleText = document.querySelector('.centered-content > h4');
var checkGallery = document.querySelector('.gallery-section')
var link = window.location.href + '?format=json-pretty';
fetch(link).then(response => {
    console.log('success', response);
    return response.json();
}).then(data => {
    console.log(data.collection.title);
    projectTitle = data.collection.title;
if(projectTitle !== "HOME" && checkGallery !== null) {

projectTitleText.textContent = projectTitle;
}
});
</script>