SSE MCP Server with JWT Authentication

🔐 SSE MCP Server with JWT Authentication

This is a Model Context Protocol (MCP) SSE server with JWT-based authentication.
It allows you to expose multiple AI tools over an SSE transport, protected via secure Bearer Token flow.

Built with:

• 🚀 Node.js + Express
• 🧩 @modelcontextprotocol/sdk
• 🔒 JSON Web Tokens (JWT) for authentication
• ⚙️ Zod for input validation

✅ Fully tested with @modelcontextprotocol/inspector

📂 Project Structure

✨ Features

• ✅ Secure SSE connection using Bearer JWT token
• ✅ Dynamic Tool registration (echo, time, random number, etc.)
• ✅ Tested with MCP Inspector
• ✅ Logs all request lifecycle events
• ✅ Session management for /message endpoint
• 🚀 Ready to extend for production use

⚙️ Setup

1. Clone the repository

2. Install dependencies

3. Create .env file

4. Run the server

✅ Server will run on:

🧪 Testing the server with MCP Inspector

Step 1 — Install MCP Inspector

📖 Official Docs: MCP Inspector

Step 2 — Generate a token

Use cURL to get your JWT token:

✅ Example response:

Step 3 — Connect MCP Inspector

1. Open Inspector UI
2. Set Transport Type: SSE
3. URL:
   http://localhost:3001/sse
4. Add Authorization Header:
   Authorization: Bearer <your-token>
5. Click Connect

🎉 Success! Your server is now connected.

Step 4 — Test tools

Go to Tools tab in Inspector and click List Tools.

You will see:

• ✅ test
• ✅ echo
• ✅ get-time
• ✅ random-number

Test them and enjoy!

📖 API Reference

🔑 Generate Token

🔌 SSE Endpoint (requires token)

📩 Send Message to active session

🧩 Tools Reference

🗓️ Upcoming Changes

• Token revocation list (blacklist)
• Role-based tool access (scope checks)
• Session heartbeat / keep-alive
• Rate limiting & logging
• Dockerization for deployment

📚 Useful Resources

• Model Context Protocol Introduction
• MCP Inspector Docs
• JWT.io Debugger
• Zod Validation Docs

👨‍💻 Maintainer

Aniket

📄 License

This project is open-source and free to use.

🚀 Build. Secure. Empower.