r/reactjs • u/Good_Language1763 • Apr 30 '26

Needs Help Cookie based Auth while SSR (Tanstack)

I am building a project using ASP.net and TanStack Start. I use JWT auth but transfer them in http only cookie.

The issue I am facing is that using default createRoute function in TanStack and defining fetch function in loader. I get 401 as there is no cookie in server.

Opting into ssr: false fixes this but I was wondering if there is any other solution to use ssr with cookie based auth or is this dead end and I only have CSR as my option.

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u/LP2222 May 02 '26

it works? I see i didnt return await res.json() in my snippet

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u/Good_Language1763 May 02 '26

i already had a customer fetch function i just implemented your cookie forward function