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

SuperTokens.com

why FetchError: request to https://....aws.supertokens.io/apiversion failed, reason: connect ETIMEDOUT 5

can you visit the connection uri on your browser? What does it say?

just call the / path, not /apiversion in your browser

Maybe check the firewall / network setting in the backend process you have used our sdk in?

http://localhost:4001/auth/dashboard/ FetchError，Maybe the cause of the firewall?

Could be. Not sure. Depends on your local setup

I changed node from 16 to 18, indicating No SuperTokens core available to query, is this also a network problem？

Yea. Something is prevent your node backend to query our core.

Whereas the core is clearly reachable from your browser.