How to determine if is new user?

[jonwizrd]

How to determine new user without setting session: { jwt: true }?

[StefanSelfTaught]

You can check for the user.id in the signIn callback:

async signIn(user, account, profile) {
   if (!user.id) {
      // do something if the user is new
   }
}

[znwhite]

@StefanSelfTaught Brand new users still seem to return a temporary user.id property.

I tried this:

  callbacks: {
    signIn: async (user, account, profile) => {
      if (user.id) {
        console.log('existing user signed in');
      } else {
        console.log('brand new user signed in');
      }
    },
  },

Even with a brand new user it still logged "existing user signed in" to the console (using Google login).

[w0wka91]

Any news on this?

[StefanSelfTaught]

You can now use the message object in the signIn event like this:

events: {
  async signIn(message) {
    console.log(message.isNewUser)
  }
}

[bennettdams]

I want to disable sign in for new users, but keep sign in for existing users. As far as I'm aware, there's no "connection" between the signIn event and the signIn callback.
Is it possible to bring the isNewUser property also to the signIn callback?

[GermanJablo]

I've opened an issue with that request: #8272

[tim-kozak]

Possible option is to look for registered user fields that are not in provider fields

callbacks: {
    signIn: async (user, account, profile) => {
      const isRegistered = user.hasOwnProperty('emailVerified');

      if (isRegistered) {
        console.log('existing user signed in');
      } else {
        console.log('brand new user signed in');
      }
    },
  },

[thander]

wtf dudes, When will new user detection work? There are different options everywhere and none of them work.
next: 14.2.15
next-auth: 4.24.8

[thander]

i found solution

  callbacks: {
    async signIn({ user, account, profile, email, credentials }) {
      await connectMongo2()
      const isNewUser = !(await User.findOne({email: user.email}))



      if (isNewUser && !email?.verificationRequest) {

      }

      return true
    },