Authentication API | Next.js Supabase SaaS Kit

A quick introduction to the Authentication API in Makerkit

How to use the Authentication API

Learn how to use the Authentication API in Makerkit

1

Checking if a user is signed in

2

Using the Authentication API in Server Actions

3

Using the Authentication API in Client Components

Checking if a user is signed in

To check if users are authed, or to retrieve information about the currently signed-in user, use the requireUser function:

import { redirect } from 'next/navigation';
import { requireUser } from '@kit/supabase/require-user';
import { getSupabaseServerClient } from '@kit/supabase/server-client';
async function ServerComponent() {
  const client = getSupabaseServerClient();
  const auth = await requireUser(client);
  // check if the user needs redirect
  if (auth.error) {
    redirect(auth.redirectTo);
  }
  // user is authed!
  const user = auth.data;
}

Using the Authentication API in Server Actions

To use the Authentication API in server actions, you can use the requireUser function. This function will return the user data if the user is signed in, or redirect the user to the login page if they are not signed in.

'use server';
import { redirect } from 'next/navigation';
import { requireUser } from '@kit/supabase/require-user';
import { getSupabaseServerClient } from '@kit/supabase/server-client';
export async function myServerAction() {
  const client = getSupabaseServerClient();
  const auth = await requireUser(client);
  // check if the user needs redirect
  if (auth.error) {
    redirect(auth.redirectTo);
  }
  // user is authed!
  const user = auth.data;
}

If the user needs MFA and is not yet verified, the redirect function will redirect the user to the MFA verification page. This is why it is important to check the redirectTo property in the response.

Using the Authentication API in Client Components

To use the Authentication API in client components, you can use the useUser hook. This hook will return the user data if the user is signed in, or redirect the user to the login page if they are not signed in.

import { useUser } from '@kit/supabase/hooks/use-user';
function MyComponent() {
  const user = useUser();
  // ...
}