MCP Express Adapter

Example Use Cases

• 1

  Lightweight local MCP servers integrated into an Express application with SSE streaming for real-time tool discovery and invocation.

• 2

  Type-safe tools and input/output validation using TypeScript and Zod when exposing tool endpoints over MCP.

• 3

  Header-based authentication and the ability to run multiple isolated MCP clients/tools on different routes to separate responsibilities and scale independently.

Description

This adapter provides an easy way to create MCP endpoints inside Express applications with Server-Sent Events (SSE) streaming, TypeScript/Zod tool helpers, and header-based authorization support. It enables mounting multiple independent MCP clients on different routes so you can scale or group MCP tools separately from your main model service. The README includes examples for integration with LangChain, CLI usage, and sample tools (weather, calculator, protected endpoints). The project is MIT-licensed, actively maintained by the community, and sponsored by tixaeagents.ai.