Javascript 谷歌图书API有问题吗

我想创建一个应用程序，用户可以使用谷歌图书API搜索图书。当前正在尝试显示搜索操作的结果，但我的请求出现问题（API密钥已启用）。如果你能帮助我，我将非常感激。这是我迄今为止创建的函数：

//requests.js file
export const loadSearchBooks = (searchTerm = '') => {
    return fetch(`https://www.googleapis.com/books/v1/volumes?q=${searchTerm}&key=${API_KEY}`)
        .then((response) => response.json());
};

//render-pages.js file
export const displaySearch = (term) => {
  loadSearchBooks(term).then((res) => MAIN.innerHTML = toSearchView(res.data));
};

//index.js file main
document.addEventListener('DOMContentLoaded', () => {
    document.addEventListener('click', (e) => {
      if (e.target.classList.contains('nav-link')) {
        loadPage(e.target.getAttribute('data-page'));
        e.preventDefault();
      }
      const currentSearch = document.getElementById('search-term').value;
      if (e.target.id === 'search-btn') {
      displaySearch(currentSearch);
    }
    });

    loadPage('home');
});