Next Auth Example
An example of how to use NextAuth.js to add authentication to a Next.js app.
NextAuth.js is a complete open source authentication solution. NextAuth.js is an easy to implement, full-stack (client/server) open source authentication library originally designed for Next.js and Serverless.
Go to next-auth.js.org for more information and documentation.
This is an example application that shows how
next-auth is applied to a basic Next.js app.
The deployed version of the original example can be found at
Our Custom Example:
Note: This example is a fork of the official NextAuth.js example repository.
This example features four different methods of implementing Next Auth authentication in a Next.js application.
A. Server-Side Configurations
1. React Server Component Usage
This example demonstrates using NextAuth.js in a React Server Component. The
auth() method is called server-side to obtain session information. This method is useful for server-rendered pages where you need to know the user's authentication status before rendering the page.
2. Route Handler Usage
This example shows how to protect API routes using NextAuth.js. The
auth() method is used within an API route (a Route Handler) to ensure that only authenticated requests can access certain data. The client-side code fetches data from this protected API route.
3. Middleware Usage
This method involves using Next.js Middleware to protect certain routes based on authentication status. The
authorized callback in the
auth.ts configuration checks if the user is authenticated and determines access to protected paths.
B. Client-Side Configuration
Client Side Rendering Usage
This example uses the
useSession React Hook from NextAuth.js to manage session state on the client side. This approach is common for pages that render primarily on the client side. It involves checking the user's session and dynamically rendering content based on the authentication status. The
UpdateForm component in this example allows for updating session information, demonstrating how to interact with the session state on the client side.
Key Concepts and Takeaways
- Server vs Client Authentication: Understanding when to use server-side or client-side authentication is crucial. Server-side methods are typically used for pages that need to be secure and rendered based on the user's session, whereas client-side methods are used for dynamic user interfaces that adapt to the session state.
- Protected Routes and API: Both server-side and client-side configurations show how to protect routes and API endpoints using NextAuth.js.
- Session Management: The examples demonstrate how to retrieve and manage session information, a key aspect of handling authentication in web applications.
- Middleware in Next.js: The middleware example highlights the powerful feature of Next.js that allows intercepting requests and implementing logic such as authentication checks before the request is processed further.
These examples are a great way to get acquainted with various authentication patterns in Next.js using NextAuth.js. Remember, the choice of method depends on the specific needs of your application, such as the level of security required, the type of content being served, and the user experience you want to provide.
Choosing the appropriate implementation method for NextAuth.js in a Next.js application
1. Consider the Application's Rendering Strategy
- Server-Side Rendering (SSR): If your page needs to be fully rendered on the server (for SEO purposes or initial load performance), use server-side authentication methods. The
getServerSidePropsfunction can be used with NextAuth.js to fetch session data on the server before rendering the page.
- Static Generation (SG): For static sites where pages are pre-rendered at build time, you might not use NextAuth.js directly in the page generation but rather manage authentication client-side.
- Client-Side Rendering (CSR): If your application is heavily client-driven, client-side methods like
useSessionare more appropriate. This is useful for dynamic content that changes based on the user's session state.
2. Type of Content and User Experience
- Dynamic vs. Static Content: If your pages display different content based on the user's session (e.g., user profiles, dashboards), client-side methods or SSR with client hydration can be appropriate.
- Real-time Data: For applications needing real-time data (like chat apps), client-side session handling can be more suitable.
3. Security Considerations
- Protected Routes and APIs: If you have API routes that should only be accessible by authenticated users, implementing session checks in API routes (middleware in Next.js) is crucial.
- Sensitive Data: For pages that display sensitive information, server-side checks can ensure that the content is only rendered for authenticated users.
4. Performance and Optimization
- Initial Load Time: SSR can be faster for the initial page load since the page is pre-rendered.
- Client-Side Interactivity: For highly interactive applications, managing sessions client-side can lead to a more responsive user experience.
5. Developer Experience and Complexity
- Simplicity: Client-side session handling with hooks like
useSessionis generally simpler and more intuitive for developers familiar with React.
- Customization and Control: Server-side methods offer more control over the authentication flow but can be more complex to implement and manage.
6. Scalability and Maintainability
- Large Scale Applications: Consider how the chosen method scales with your application. SSR and middleware can add complexity as your application grows.
- Codebase Consistency: Choose a method that aligns with the overall architecture and patterns of your codebase to maintain consistency.
1. Clone the repository and install dependencies
git clone https://github.com/owolfdev/next-auth-example.git
2. Configure your local environment
Copy the .env.local.example file in this directory to .env.local (which will be ignored by Git):
cp .env.local.example .env.local
Add details for one or more providers (e.g. Google, Twitter, GitHub, Email, etc).
A database is needed to persist user accounts and to support email sign in. However, you can still use NextAuth.js for authentication without a database by using OAuth for authentication. If you do not specify a database, JSON Web Tokens will be enabled by default.
You can skip configuring a database and come back to it later if you want.
For more information about setting up a database, please check out the following links:
3. Configure Authentication Providers
Review and update options in
When setting up OAuth, in the developer admin page for each of your OAuth services, you should configure the callback URL to use a callback path of
e.g. For Google OAuth you would use:
A list of configured providers and their callback URLs is available from the endpoint
api/auth/providers. You can find more information at https://authjs.dev/getting-started/providers/oauth-tutorial
- You can also choose to specify an SMTP server for passwordless sign in via email.
4. Start the application
To run your site locally, use:
npm run devbash
To run it in production mode, use:
npm run build npm run startbash
5. Preparing for Production
Follow the Deployment documentation
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