Express MCP Handler

Express-mcp-handler is a middleware library designed to integrate the Model Context Protocol (MCP) into Express.js applications. It facilitates seamless communication between large language models (LLMs) and external tools or data sources by providing standardized handling for MCP requests. The package is currently in version 0.3.0, indicating it is in early development and its API may evolve rapidly, though it appears actively maintained. Key differentiators include its ability to manage stateful, stateless, and Server-Sent Events (SSE) based MCP interactions, offering a flexible solution for various integration patterns. Built with TypeScript, it provides a type-safe API, enhancing reliability and developer experience. It also offers customizable options for error handling, session management, and lifecycle hooks, making it adaptable to complex application requirements, and directly plugs into existing Express routes.