What's the best way to get the userId in prisma/AuthJs?

export async function POST(request: Request) {
  const session = await getServerSession(authOptions);

  const getUserId = await prisma.user.findUnique({
    where: { email: session!.user!.email! },
  });

  const newCategory = await prisma.todo.create({
    data: {
      pinned: false,
      text: "Hi",
      userId: getUserId!.id!,
    },
  });
  return NextResponse.json({ getUserId, newCategory });
}

export async function POST(request: Request) {
  const session = await getServerSession(authOptions);

  const getUserId = await prisma.user.findUnique({
    where: { email: session!.user!.email! },
  });

  const newCategory = await prisma.todo.create({
    data: {
      pinned: false,
      text: "Hi",
      userId: getUserId!.id!,
    },
  });
  return NextResponse.json({ getUserId, newCategory });
}