ts-npm-ytmusic-api/docs/guides/usage.md

Usage

YTMusic provides you with many ways of fetching data from YouTube Music
To leverage all the functions, we will need to create an instance of the class YTMusic. Then, call the initialize() to initialize the API before using the API anywhere

const ytmusic = new YTMusic()
ytmusic.initialize().then(() => {
	// Use API here
})

In an async context, you can initialize the API in one line

const ytmusic = await new YTMusic().initialize()
// Use API here

Custom Cookies

If you want to use your own cookies for all requests, you can do so like this

const ytmusic = await new YTMusic()
	.initialize("COOKIES=here; COOKIES=here; COOKIES=here")