TanStack Start Integration

This integration guide is assuming you are using TanStack Start.

Before you start, make sure you have a Better Auth instance configured. If you haven't done that yet, check out the installation.

Mount the handler

We need to mount the handler to a TanStack API endpoint. Create a new file: /app/routes/api/auth/$.ts

import { auth } from '@/lib/auth'
import { createAPIFileRoute } from '@tanstack/react-start/api'
 
export const APIRoute = createAPIFileRoute('/api/auth/$')({
  GET: ({ request }) => {
    return auth.handler(request)
  },
  POST: ({ request }) => {
    return auth.handler(request)
  },
})

This will allow you to access use the getSession method in all of your routes.