🐞 Bug Report: getUserSession(event) returns partial session in cachedEventHandler

[mrkaashee]

When using getUserSession(event) inside a cachedEventHandler, the returned session object only includes the id:

// inside cachedEventHandler
const session = await getUserSession(event);
console.log(session);
// Output: { id: '99ca50c6-297f-429c-8f53-5903d6ecd74b' }

However, in defineEventHandler, the same call returns the full session with the user object populated:

// inside defineEventHandler
const session = await getUserSession(event);
console.log(session);
// Output includes: session.user = { id, username, roles, etc. }

Expected Behavior

Calling getUserSession(event) should return the same structure and data, regardless of whether the handler is wrapped in defineEventHandler or cachedEventHandler.

Actual Behavior

• In cachedEventHandler, session.user is missing.

• In defineEventHandler, session.user is present.

Notes

• We're not caching session data.

• Session is being retrieved solely to enrich or filter unrelated cached data.

• The inconsistency leads to partial functionality or the need for workarounds.

[JessicaSachs]

I'd honestly like to understand at a core level why I'm seeing similar partial results during normal defineEventHandler execution, but only on a Full Page refresh.

[mrkaashee]

I initially thought it was an issue with Nuxt Auth Utils, but after digging in, I found that the root cause is in Nitro — specifically, defineCachedEventHandler clones the req/res objects, which breaks session/auth detection. I’ve documented the details here: nitrojs/nitro#3468

Might be worth checking out if you're seeing anything similar or are curious about the underlying behavior.

[mrkaashee]

No worries — I found a workaround that works well!

You can use defineEventHandler to handle session logic (e.g. getUserSession()), and then call a defineCachedFunction inside it, passing the user/session data as needed. This way, you avoid the issue with cloned req/res objects.

Let me know if you want a code example — happy to share!

[tibor-cernak]

I'd honestly like to understand at a core level why I'm seeing similar partial results during normal defineEventHandler execution, but only on a Full Page refresh.

I'm having exactly the same issue, have you found out more about this? Thanks.

[mrkaashee]

I’ve documented the details here: nitrojs/nitro#3468

[atinux]

I believe this is indeed related to Nitro.

I just tested locally in my playground and I cannot reproduce this behavior, can you try with latest Nuxt & Nitro versions?

[mpgalaxy]

On nuxt 4.2.1 with nuxt-auth-utils 0.5.25 getUserSession(event) also returns an empty session (inside defineEventHandler) only containing the id in contrast to the output of the composable on client side: (keycloak provider, OIDC)

// inside defineEventHandler
const session = await getUserSession(event);
console.log(session);
// Output: { id: '9c6894b5-7d14-41e3-b6ee-c314eebe5647' }

Regular session from composable:

{ "user": 
  { 
     "userId": "bb960eac-f44c-4d8d-ac4f-9f739bfe3126", 
     "firstName": "Test", 
     "lastName": "User", 
     "email": "some@email.org", 
     "preferred_username": "test", 
     "expirationDate": "2025-11-26T12:07:44.447Z" 
  }, 
 "access_token": myAccessToken,
 "refresh_token": myRefreshToken,
 "expires_in": 360, 
 "refresh_expires_in": 420, 
 "loggedInAt": "2025-11-26T12:01:44.447Z", 
 "id": "d6db010c-d68b-483c-adde-ac134652c9bf" 
}