How do you implement protected routes and auth redirects in TanStack Router?

Use beforeLoad with throw redirect(). This halts the route loading process before the component ever mounts — no flash of protected content.

import { createRoute, redirect } from "@tanstack/vue-router"
import { getAuthToken }          from "../auth"

async function requireAuth({ location }:any){
  if(!getAuthToken())
    throw redirect({ to:"/login", search:{ redirect:location.href } })
}

export const dashboardRoute=createRoute({
  getParentRoute: ()=>rootRoute,
  path:           "/dashboard",
  component:      DashboardPage,
  beforeLoad:     requireAuth,
})

export const loginRoute=createRoute({
  getParentRoute: ()=>rootRoute,
  path:           "/login",
  component:      LoginPage,
  beforeLoad: ({ search })=>{
    if(getAuthToken())
      throw redirect({ to:(search as any).redirect??"/dashboard", replace:true })
  },
})

// In LoginPage.vue
import { useSearch, useNavigate } from "@tanstack/vue-router"
const search=useSearch({ from:"/login" })
const nav=useNavigate()
async function handleLogin(creds){
  await login(creds)
  nav({ to:(search as any).redirect??"/dashboard", replace:true })
}

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