Most likely, the reason your fetch request gets denied is that your browser's CORS restrictions are the ones blocking you. Browsers enforce CORS for security purposes. If the required CORS headers (Access-Control-Allow-Origin, in this specific case) are not sent by the server at your mention site, your browser will disallow the JavaScript code which executes from a different domain (most likely your HTML File, if you launch the HTML document directly, or a local web server such as http://localhost:xxxx) from accessing the content.