SuperTokens is an open source authentication solution offering features like: Different types of login: Email / password, Passwordless (OTP or Magic link based).

SuperTokens.com

Hello, I am trying to use supertokens to provide passwordless + google login on my website (html js, server in golang) but I read that the prebuilt ui is not supported for web and I can't seem to figure out how to actually proceed with the login after adding the script tags and calling the supertokens.init function

The prebuilt UI is only available for React

You can use supertokens-web-js for non React based web apps

is there any documentation for supertokens-web-js?

Yep in the sidebar for the docs, select "Using your own UI"

The docs there mention how to use supertokens-web-js

okay thanks, will reach out if any problems