This project demonstrates how to implement authentication in a Next.js application using NextAuth.js with various authentication providers.

• Session Strategy: The session: { strategy: 'jwt' } configuration specifies that NextAuth.js is using JSON Web Tokens (JWT) for session management. After a user is authenticated, a JWT is issued and used to manage the session state.

  • Providers: This application supports authentication via Google, GitHub, and custom credentials (email/password):

  • GoogleProvider and GitHubProvider: OAuth providers configured with clientId and clientSecret for integration with Google and GitHub.

  • CredentialsProvider: Custom provider with an authorize function to handle email/password authentication. It uses bcrypt for secure password comparison against credentials stored in the database.

• Custom Authentication Logic: The authorize function in CredentialsProvider validates user credentials and returns the user object upon successful authentication. It includes error handling for cases where the user is not found or the password does not match, ensuring robust security and a smooth authentication flow.

• Environment Variables: Sensitive information like clientId and clientSecret for Google and GitHub providers are stored in environment variables (process.env) to maintain security and prevent exposing credentials in the source code.

This is a Next.js project bootstrapped with create-next-app.

• First, install dependencies using,

  npm install

• Create a .env file at the root of the project folder with the following content:

  GOOGLE_CLIENT_ID=<YOUR_GOOGLE_CLIENT_ID>
  GOOGLE_CLIENT_SECRET=<YOUR_GOOGLE_CLIENT_ID>
  GITHUB_CLIENT_ID=<YOUR_GITHUB_CLIENT_ID>
  GITHUB_CLIENT_SECRET=<YOUR_GITHUB_CLIENT_ID>
  AUTH_SECRET="Auth Secret"
  MONGO_DB_CONNECTION_STRING="YOUR OWN DATABASE CONNECTION STRING"

• Then, run the development server:

npm run dev
# or
yarn dev
# or
pnpm dev
# or
bun dev

Open http://localhost:3000 with your browser to see the result.

• Replace placeholders like your-google-client-id, your-google-client-secret, your-github-client-id, your-github-client-secret, and YOUR OWN DATABASE CONNECTION STRING with your actual credentials and MongoDB URI.
• Provide additional instructions or configuration details specific to your application if necessary.
• Include any additional dependencies or libraries used in your project in the "Features" or "Getting Started" sections as needed.

This README.md file provides a clear overview of your Next.js authentication application, guiding users on setting up and running the project locally, and pointing them to relevant documentation for further learning. Adjust it according to your specific application requirements and deployment environment.