I've found a recent youtube video in this [link](https://www.youtube.com/watch?v=z2A9P1Zg1WM) which suggests the following folder structure.
Which one is the good starter?

Thank you for the kind answer.
I've successfully created route.ts file as in the image.
Now I'm trying to use useSession hook in my client-side code, which requires SessionProvider.
But in the [document](https://next-auth.js.org/configuration/nextjs#getserversession), it recommends using getServerSession instead of SessionProvider. However, I'm not understanding how to properly create those files in which folder.
Could you please simply show a guide for the folder structure?

getServerSession and SessionProvider are two different things. The getServerSession method is for all serverside stuff. The SessionProvider is for all clientside stuff.

You linked a file, that shows how you don't need to pass authOptions around. Because when you want to get the session serverside with getServerSession you need to add the auth options as argument to it: await getServerSession(authOptions).

The step that you linked is optional and only makes an easier function.
This:

const session = await getServerSession(authOptions);

Becomes this (with your helper function):

const session = await getServerSession();

Oh, you mean I can create a @/utils/helper.ts for the code from the document, and use it as you mentioned?

const session = await getServerSession();

import type {
  GetServerSidePropsContext,
  NextApiRequest,
  NextApiResponse,
} from "next"
import type { NextAuthOptions } from "next-auth"
import { getServerSession } from "next-auth"

// You'll need to import and pass this
// to `NextAuth` in `app/api/auth/[...nextauth]/route.ts`
export const config = {
  providers: [], // rest of your config
} satisfies NextAuthOptions

// Use it in server contexts
export function auth(
  ...args:
    | [GetServerSidePropsContext["req"], GetServerSidePropsContext["res"]]
    | [NextApiRequest, NextApiResponse]
    | []
) {
  return getServerSession(...args, config)
}

I haven't ever created the helper myself, so idk. I guess it's https://tryitands.ee/

Ok thank you!

happy to help