mcp-handler
mcp-handler is a framework-agnostic HTTP adapter for hosting Model Context Protocol (MCP) servers in JavaScript and TypeScript applications. It turns an MCP server definition into a Web-standard (Request) => Promise<Response> handler that can be mounted in Next.js, Nuxt/Nitro, SvelteKit, Hono, and other Fetch-compatible frameworks.
Built on MCP SDK v2, it serves the 2026-07-28 MCP specification natively while transparently falling back to stateless Streamable HTTP for 2025-era clients — one handler, both protocol generations.