So the

websiteDomain

should be

"https://blah-blah.execute-api.blah-blah.amazonaws.com"

and there is

websiteBasePath

which should be changed to

"/dev/auth"

. For development, youe

websiteDomain

will be

"http://localhost:3000"

. Finally, CORS error can be fixed by doing this step: https://supertokens.io/docs/thirdpartyemailpassword/quick-setup/backend#3-add-the-supertokens-and-cors-middleware, where the

origin

value should be

"http://localhost:3000"

.