The Fetch API and async() functions with await are modern JavaScript patterns that aren’t always supported by old browsers, particularly non-Edge IE browsers.

Q&A Mastering Modern JavaScript By David Ramel 04/22/2025 JavaScript could be the most widely used programming language in the world, but for many developers, its modern version looks very different ...

Callbacks work fine for handling asynchronous code in JavaScript, but promises and the async and await keywords are cleaner and more flexible.