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

SuperTokens.com

Hi, I'm having an issue with React where login status is successful but the Session.doesSessionExist returns false. I'm ussing cookie headers.

In one of my other apps with different supertokens core backend, it works. On my new one, it doesn't work.

I notice a difference that one of them have an IdToken (works) and my second app that doesn't have IdToken in signin response - doesn't work. Is this a bug??

Could this be a V5 bug on client libraries with V5 release?

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Okay, I just had to update my client libraries in JS. A nice to have would be an error that says the sdk is not compatiable when connecting (if possible)

Right. So the frontend and backend SDks don't have a way of knowing about compatibility yet. But you can see this here: https://supertokens.com/docs/thirdpartyemailpassword/compatibility-table