Mcpauth

@mcpauth/auth

A full-featured, self-hostable OAuth 2.0 server designed for the Modern AI-era and the Model-Context-Protocol (MCP).

@mcpauth/auth empowers you to secure your MCP applications with a robust and flexible OAuth 2.0 implementation that you control.

Live Demo

Check out the live demo of @mcpauth/auth in action, deployed on Vercel:

https://mcpauth-nextjs.vercel.app/

The source code for this demo is available in the [apps/nextjs](./apps/nextjs) directory of this repository.

For more live examples, see the Examples page in the documentation.

Docs

The documentation for @mcpauth/auth is available at https://mcpauth-docs.vercel.app/.

Why @mcpauth/auth?

Own Your Data and Your Authentication

With @mcpauth/auth, you host the server, you own the data. No separate authorization server. No vendor lock-in.

Required for Modern MCP Clients

Major MCP clients like OpenAI's ChatGPT require OAuth 2.0 for authenticating users and authorizing access to tools and resources. @mcpauth/auth provides the compliant, secure server you need to integrate with these modern clients.

Seamlessly Integrate Your Existing Auth

The biggest challenge with adopting a new authentication system is integrating it with your existing user management. @mcpauth/auth solves this with a single, powerful function: authenticateUser.

This function allows you to plug in any existing authentication logic. Whether your users are authenticated via a session cookie, a bearer token, or an external system, you can validate them and link them to the OAuth flow with just a few lines of code.

For example, if you're using @auth/express for session management, your implementation is as simple as this:

  authenticateUser: async (request: Request) => {
    // Grab the user's existing session from a cookie
    const session = await getSession(request, authConfig);
    // Return the user object if they are authenticated, or null if not
    return (session?.user as OAuthUser) ?? null;
  },

This flexibility means you can add a compliant MCP OAuth layer to your application without rebuilding your entire authentication stack.

Compatibility

@mcpauth/auth is designed to be adaptable to your existing stack. Here's a summary of our currently supported frameworks and database stores:

| Type | Supported | Notes | | :-------- | :----------------------- | :--------------------------------------------------------------------- | | Framework | Next.js, Express | Adapters provide seamless integration with popular Node.js frameworks. | | Database | Prisma, Drizzle | Stores handle all the database interactions for OAuth entities. |

Don't see your preferred framework or database? Request a new adapter or store by opening an issue on GitHub.

Note for ChatGPT Deep Research Connectors

ChatGPT's Deep Research Custom Connector is a new feature that allows you to use OpenAI's ChatGPT with your own data. It's a great way to get started with MCP, and requires an OAuth 2.0 server to authenticate users and authorize access to tools and resources.

@mcpauth/auth provides the compliant, secure server you need to integrate with ChatGPT's Deep Research Custom Connector.

There are a few issues with ChatGPT's Custom Connectors (across all MCP servers). They have been actively fixing many of these issues, but some remain. For example, after adding a new custom connector, you'll frequently get a "This connector does not implement our schema" error. This is a known issue, and refreshing your page often fixes it.

Contributing

We're open to all community contributions!

License

ISC

Source & license

This open-source MCP server is cataloged on AgentStack and links to its original source — we do not rehost the code.

• Author: mcpauth
• Source: mcpauth/mcpauth
• License: ISC
• Homepage: https://mcpauth.app/

Install and usage instructions live in the source repository linked above.