📌Overview

Purpose: To facilitate communication between MCP servers using stdio transport via a TypeScript SSE proxy.

Overview: MCP Proxy is designed to create a seamless connection for MCP servers utilizing standard input/output transport. It establishes an SSE server that forwards real-time messages, enhancing communication and data flow between clients and servers in a structured manner.

Key Features:

• SSE Server Setup: Enables users to conveniently start an SSE server with specified port and endpoints, forwarding messages to a connected stdio server.

• Proxy Server Utility: Provides robust utilities to establish a proxy flow between server and client, ensuring bidirectional communication with minimal configuration.

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MCP Proxy

A TypeScript SSE proxy for MCP servers that use stdio transport.

CORS is enabled by default.

For a Python implementation, see mcp-proxy.

MCP Proxy is what FastMCP uses to enable SSE.

Installation

npm install mcp-proxy

Quickstart

Command-line

npx mcp-proxy --port 8080 --endpoint /sse tsx server.js

This starts an SSE server and stdio server (tsx server.js). The SSE server listens on port 8080 and endpoint /sse, and forwards messages to the stdio server.

Node.js SDK

The Node.js SDK provides utilities to create a proxy.

proxyServer

Sets up a proxy between a server and a client.

const transport = new StdioClientTransport();
const client = new Client();

const server = new Server(serverVersion, {
  capabilities: {},
});

proxyServer({
  server,
  client,
  capabilities: {},
});

In this example, the server will proxy all requests to the client and vice versa.

startSSEServer

Starts a proxy that listens on a port and endpoint, and sends messages to the attached server via SSEServerTransport.

import { Server } from "@modelcontextprotocol/sdk/server/index.js";
import { startSSEServer } from "mcp-proxy";

const { close } = await startSSEServer({
  port: 8080,
  endpoint: "/sse",
  createServer: async () => {
    return new Server();
  },
});

close();

tapTransport

Taps into a transport and logs events.

import { tapTransport } from "mcp-proxy";

const transport = tapTransport(new StdioClientTransport(), (event) => {
  console.log(event);
});