How to get user id in Node/Express resource server

I set up the example Node/Express resource server and I’m wondering how to access the authenticated user’s id, group, etc. in the Express app so I can apply it to SQL queries there.
I have a case where an identifier from the Okta authenticated user needs to be mapped to a user id on the database so user (group) specific results are returned. Can you point me to a code example?

If you’re using @okta/oidc-middleware, you can use req.userinfo to get info about the authenticated user as shown here: https://github.com/okta/okta-oidc-js/tree/master/packages/oidc-middleware#requserinfo

If you want groups, you’ll need to add the groups scope to the ExpressOIDC constructor:
https://developer.okta.com/docs/api/resources/oidc.html#scope-dependent-claims-not-always-returned

Be aware of the current 100 group limitation