JS for smooth scroll to the bottom of the page

With pure JS:

 window.scrollTo({ top: document.body.scrollHeight, behavior: 'smooth' })

and to the top as:

 window.scrollTo({ top: 0, behavior: 'smooth' })

There is no such thing as scrollToBottom. Try this:

$("html, body").animate({ scrollTop: document.body.scrollHeight }, "slow");