# withAuthProps: Auth Page Props in Next.js Firebase

> The "withAuthProps" is a function that is used to populate the props of the auth pages. It is used in the "getServerSideProps" function of the pages you want to gate.

*Canonical: https://makerkit.dev/docs/next-fire/api/withAuthProps*

---

The `withAuthProps` function is used to populate the props of the authentication pages. You may never need to use it unless you introduce new authentication pages.

This function is used in the `getServerSideProps` function of the authentication pages.

```tsx
import { withAuthProps } from "~/lib/props/with-auth-props";
import { GetServerSidePropsContext } from "next";

export async function getServerSideProps(ctx: GetServerSidePropsContext) {
  return await withAuthProps(ctx);
}
```

This function ensures **authenticated users won't be able to access the authentication pages**.