Next.js Code Snippets

import NextAuth, { type NextAuthOptions } from 'next-auth';
import GoogleProvider from 'next-auth/providers/google';
import GitHubProvider from 'next-auth/providers/github';
import FacebookProvider from 'next-auth/providers/facebook';
import type { JWT } from 'next-auth/jwt';
import type { Session } from 'next-auth';

export const authOptions: NextAuthOptions = {
  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!,
    }),
    FacebookProvider({
      clientId: process.env.FACEBOOK_CLIENT_ID!,
      clientSecret: process.env.FACEBOOK_CLIENT_SECRET!,
    }),
  ],

  callbacks: {
    async jwt({ token, user, account }): Promise<JWT> {
      if (user) {
        token.id = (user as any).id;
      }
      if (account?.access_token) {
        token.accessToken = account.access_token;
      }
      return token;
    },

    async session({ session, token }): Promise<Session> {
      if (session.user) {
        (session.user as any).id = token.id;
      }
      (session as any).accessToken = token.accessToken;
      return session;
    }
  },

  pages: {
    signIn: '/auth/signin',
    signUp: '/auth/signup',
  },

  secret: process.env.NEXTAUTH_SECRET!,
};

const handler = NextAuth(authOptions);
export { handler as GET, handler as POST };

# NextAuth.js
NEXTAUTH_URL=http://localhost:3000
NEXTAUTH_SECRET=your-secret-key-here

# Google OAuth
GOOGLE_CLIENT_ID=your-google-client-id
GOOGLE_CLIENT_SECRET=your-google-client-secret

# GitHub OAuth
GITHUB_ID=your-github-id
GITHUB_SECRET=your-github-secret

# Facebook OAuth
FACEBOOK_CLIENT_ID=your-facebook-app-id
FACEBOOK_CLIENT_SECRET=your-facebook-app-secret