Theo's Typesafe Cult•4mo ago

create-t3-app next auth question

In the default auth settings for t3, I noticed id: token.sub in the callbacks making the id available on the user object. Is this sub something I can use as my unique user/account id in my db? What is sub?

export const authOptions: NextAuthOptions = {
  callbacks: {
    session: ({ session, token }) => ({
      ...session,
      user: {
        ...session.user,
        id: token.sub,
      },
    }),
  },

export const authOptions: NextAuthOptions = {
  callbacks: {
    session: ({ session, token }) => ({
      ...session,
      user: {
        ...session.user,
        id: token.sub,
      },
    }),
  },

Solution:

Yes, unless you change it, as per https://github.com/nextauthjs/next-auth/discussions/6695

GitHub

JWT sub property · nextauthjs next-auth · Discussion #6695

Question 💬 I am currently working on Nextjs project and using nextAuth for authentication . right now whenever any user completes sign in then the JWT generated has sub property which always contai...

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7 Replies

Solution

Vincent Udén•4mo ago

Yes, unless you change it, as per https://github.com/nextauthjs/next-auth/discussions/6695

GitHub

JWT sub property · nextauthjs next-auth · Discussion #6695

Vengeance•4mo ago

So if someone signs in with apple, google, or custom credentials, they will all be given that unique id in sub that won't be changed unless I change it?

Vincent Udén•4mo ago

Im not sure what you are asking. A sign in using apple would be a new user even if a google account exists with the same email linked to it. If that is what you are asking

Vengeance•4mo ago

yes, thank you 🙏

Vincent Udén•4mo ago

NextAuth has no way of know if a person in real life has multiple accounts on different services. Im not even sure how it would know that. That's why they are all distinct

Vengeance•4mo ago

i just wanted to make sure the sub would be unique and never change (other than by me) so that it would be ok to use that as the unique identifier for my users

Vincent Udén•4mo ago

Allright, please mark the question as solved by the way

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create-t3-app next auth question