Making an extension from scratch can be a daunting task. Luckily, Spicetify provides a powerful API Wrapper that makes it easy to interact with Spotify's internal APIs as well as provide out-of-the-box methods to help you easily create extensions.
You can access the Spicetify object by typing
Spicetify in the DevTools console, inside your extension, or
window.top.Spicetify if you're developing an app inside an
Navigate the sidebar to see all the methods and properties available in the Spicetify object!