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@modelcontextprotocol/express

Express middleware and OAuth server support for MCP.

Installation

npm install @modelcontextprotocol/express

Exports

  • createMcpExpressApp() - Create an Express app with MCP-compatible middleware
  • mcpAuthRouter() - OAuth 2.0 authorization server router
  • requireBearerAuth() - Bearer token authentication middleware
  • mcpAuthMetadataRouter() - Protected resource metadata endpoints

Usage

import { createMcpExpressApp, mcpAuthRouter } from '@modelcontextprotocol/express';
import { StreamableHTTPServerTransport } from '@modelcontextprotocol/node';
import { McpServer } from '@modelcontextprotocol/server';

const app = createMcpExpressApp();
const server = new McpServer({ name: 'my-server', version: '1.0.0' });

app.post('/mcp', async (req, res) => {
    const transport = new StreamableHTTPServerTransport({ sessionIdGenerator: () => crypto.randomUUID() });
    await server.connect(transport);
    await transport.handleRequest(req, res, req.body);
});

app.listen(3000);