How to update session for credentials provider with custom backend?

[jaekunchoi]

I have custom backend that provides JWT and also using credentials provider in NextAuth. I also want to ensure session expiry is updated (with JWT expiry updated) whenever user makes a request with Axios. I can intercept request at _document.js.

It seems Next Auth encodes JWT token retrieved from backend again with another JWT token. So when I decode, I get JWT token for the backend server that was generated from. The problem is I have to work with two expiry and update both the custom backend server with new JWT and expiry then on Next Auth with new JWT and expiry.

I think I can do this with jwt callback but how can I invoke this from getInitialProps in _document.js where I can intercept the request/response before and after custom backend request?