Welcome to @mcpauth/auth

A full-featured, self-hosted OAuth 2.0 server purpose-built for the Model-Context-Protocol (MCP) ecosystem.

Why @mcpauth/auth?


Self-Hosted	Own your data and authentication flow. No SaaS vendor lock-in.
MCP-Ready	Required by modern MCP clients (e.g. ChatGPT) for secure tool access.
Plugs Into Existing Auth	Use the `authenticateUser` callback to bridge any cookie, session or token system.
Framework Adapters	Official Next.js and Express adapters – more coming.
Database Stores	Works with Prisma & Drizzle out-of-the-box.
Extensible & OSS	100 % open-source. Request or build new adapters & stores.

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

The source code for this demo is available in the apps/nextjs directory of the GitHub repository.

npm install @mcpauth/auth

Ready to dive in? Start with Installation below or jump directly to an adapter guide.