next/dist/esm/server/mcp/get-mcp-middleware.js

The React Framework

import { getOrCreateMcpServer } from './get-or-create-mcp-server';
import { parseBody } from '../api-utils/node/parse-body';
import { StreamableHTTPServerTransport } from 'next/dist/compiled/@modelcontextprotocol/sdk/server/streamableHttp';
export function getMcpMiddleware(options) {
    return async function(req, res, next) {
        const { pathname } = new URL(req.url || '', 'http://n');
        if (!pathname.startsWith('/_next/mcp')) {
            return next();
        }
        const mcpServer = getOrCreateMcpServer(options);
        const transport = new StreamableHTTPServerTransport({
            sessionIdGenerator: undefined
        });
        try {
            res.on('close', ()=>{
                transport.close();
            });
            await mcpServer.connect(transport);
            const parsedBody = await parseBody(req, 1024 * 1024) // 1MB limit
            ;
            await transport.handleRequest(req, res, parsedBody);
        } catch (error) {
            if (!res.headersSent) {
                res.statusCode = 500;
                res.setHeader('Content-Type', 'application/json; charset=utf-8');
                res.end(JSON.stringify({
                    jsonrpc: '2.0',
                    error: {
                        code: -32000,
                        message: 'Internal server error'
                    },
                    id: null
                }));
            }
        }
    };
}

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