TanStack Start + Elysia Template

Tanstack Form + better-auth

Session check (Client)

Session check (Server)

API Fetch (Client)

API Fetch (Server)

[]

API Error handling (Server)

{
  "code": "internal-server-error",
  "status": 500,
  "message": "This is an internal server error example"
}
{
  "code": "not-found",
  "status": 404,
  "message": "This is a not found error example"
}

API Typecheck (Server)

data.now: 2026-10-08T13:42:12.378Z
typeof data.now: string
data.now instanceof Date: no