ExpressJS MCP

/** * Example 01: Basic Usage * * This example demonstrates the simplest way to add MCP capabilities to an Express app. * It automatically exposes all routes as MCP tools with minimal configuration. */ import express from "express"; import { ExpressMCP } from "../../src"; const app = express(); app.use(express.json()); app.get("/hello", (_req, res) => res.json({ message: "world" })); app.post("/order", (req, res) => res.status(201).json({ id: "o1", ...req.body }), ); const mcp = new ExpressMCP(app, { mountPath: "/mcp" }); await mcp.init(); mcp.mount("/mcp"); app.listen(3000, () => console.log("App on http://localhost:3000 → /mcp/tools, /mcp/invoke"), ); // Demo: List available tools if (process.env.NODE_ENV !== "production") { // Show available tools in development setTimeout(() => { const tools = mcp.listTools(); console.log(`\n🔧 Discovered ${tools.length} MCP tools:`); for (const tool of tools) { const toolObj = tool as { title: string; description: string }; console.log(` - ${toolObj.title}: ${toolObj.description}`); } }); }