Tips on retaining user data when logging in with Next.js and Nex-auth

I'm a beginner with next-auth. When I click on the sign in button, it redirects me to the Google sign-in page where it displays a list of accounts. Upon selecting an account, it shows the user's image and email.

The signIn() function is imported from the next-auth/react module. If I want to store the user's email and image in a database, how can I achieve that? I would like this saving process to happen automatically when users choose their account.

Where should I incorporate the code for saving the user data in the database, including steps like using the model for data and establishing a DB connection?

//pages/index.js:

import { useSession, signIn, signOut } from "next-auth/react";

export default function Home() {
  const { data: session } = useSession();

  if (session) {
    return (
      <>
        <p>Signed in as {session.user.email}</p>
        <img src={session.user.image} />
        <button onClick={() => signOut()}>Sign out</button>
      </>
    );
  }
  return (
    <div>
      <p>Not signed in</p>
      <button onClick={() => signIn()}>Sign in</button>
    </div>
  );
}

//pages/api/auth/[...nextauth].js

import NextAuth from "next-auth/next";
import GoogleProvider from 'next-auth/providers/google'

export default NextAuth({
  providers: [
    GoogleProvider({
      clientId: process.env.GOOGLE_ID,
      clientSecret: process.env.GOOGLE_SECRET
    })
  ],
});

Answer №1

Essentially, the key is to utilize an adapter:

An Adapter in NextAuth.js serves as a connection between your application and the backend system or database where user data, accounts, sessions, etc., are stored.

To understand how to proceed, refer to the relevant information provided in the NextAuth documentation regarding the adapter needed for your specific database.

The type of adapter required will depend on the backend/database being used; in my scenario, Prisma with MongoDB is utilized, resulting in the following configuration within my next auth endpoint file [...nextauth].ts:

import NextAuth from 'next-auth/next';
import GitHubProvider from 'next-auth/providers/github';
import GoogleProvider from 'next-auth/providers/google';
import {PrismaAdapter} from '@next-auth/prisma-adapter';
import { PrismaClient } from '@prisma/client';

const client = new PrismaClient(); 

export default NextAuth({
  adapter: PrismaAdapter(client), 
  providers: [
    GoogleProvider({
      clientId: process.env.GOOGLE_CLIENT_ID!,
      clientSecret: process.env.GOOGLE_CLIENT_SECRET!,
    }),
    GitHubProvider({
      clientId: process.env.GITHUB_ID!,
      clientSecret: process.env.GITHUB_SECRET!,
    }),
  ],
  secret: process.env.NEXTAUTH_SECRET,   
});

Answer №2

Here is an excellent illustration of how callbacks can be utilized to manage user data and conduct various checks during the sign-in process. In this scenario, once the user chooses their Gmail ID, the signin callback is triggered. At this point, you have the opportunity to verify if the user already exists or not and make decisions accordingly - perhaps saving the data (si

import NextAuth from 'next-auth';
import GoogleProvider from 'next-auth/providers/google'
import SignToken from "@/lib/SignToken";
import axios from "axios";

export default NextAuth({
  providers: [
    GoogleProvider({
      clientId: process.env.GOOGLE_CLIENT_ID as string,
      clientSecret: process.env.GOOGLE_CLIENT_SECRET as string,
    }),
  ],
  secret: process.env.NEXTAUTH_SECRET,
  callbacks: {
    async signIn({ user, account, profile }) {
      const response = await axios.post(
        process.env.NEXT_PUBLIC_API_BASE_URL + "/auth/userExists",
        { email: profile?.email }
      );
      if (response && response.data?.value === true) {
        return true;
      } else {
        const data = {
          firstName: profile.given_name,
          lastName: profile.family_name,
          email: profile.email,
          profileUrl: profile.picture,
        };
        const response = await axios.post(
          process.env.NEXT_PUBLIC_API_BASE_URL + "/auth/signup",
          data
        );
        return true;
      }
    },
    async jwt({ token, user, account, profile, isNewUser }) {
      console.log('called jwt');
      console.log(token, user, account, profile, isNewUser);
      if (account) {
        const userLoggedIn = await SignToken(user?.email as string);
        token.loggedUser = userLoggedIn;
      }
      return token;
    },
    async session({ session, token, user }) {
      session.loggedUser = token.loggedUser;
      return session;
    },
  },
});

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