To start, we’ll lay out a simple JavaScript program using promises, then we’ll refactor it to use async and await. In our example, we’ll use axios, a promise-based HTTP library.

Asynchronous programming in JavaScript leverages features like callbacks, promises and async/await to sidestep this issue by allowing other code to run in the meantime.

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