read-post.html

<html>

<head>
    <script src="https://unpkg.com/@tryghost/content-api@latest/umd/content-api.min.js"></script>
    <script>
       const api = new GhostContentAPI({
  url: 'https://demo.ghost.io',
  key: '22444f78447824223cefc48062',
  version: "v3"
});

// Fetch a single post by slug
api.posts
    .read({slug: 'publishing-options'})
    .then((post) => {
        console.log(post);
        document.querySelector('#result').textContent = JSON.stringify(post);
    })
    .catch((err) => {
        console.error(err);
    });
</script>
</head>
<body>
    <h1>Hello world</h1>
    <div id="result"></div>
</body>
</html>