Transports
MCP Transports: How Clients Talk to Servers
Transports define how MCP clients and servers communicate. There are two main options: stdio for local servers and Streamable HTTP for remote servers.
typescript
// STDIO Transport (local)
// Host spawns server as child process
// Communication via stdin/stdout
import { StdioServerTransport } from "@modelcontextprotocol/sdk/server/stdio.js";
const transport = new StdioServerTransport();
await server.connect(transport);
// Streamable HTTP Transport (remote)
// Server runs on a URL
import express from "express";
import { StreamableHTTPServerTransport } from "@modelcontextprotocol/sdk/server/streamableHttp.js";
const app = express();
app.post("/mcp", async (req, res) => {
const transport = new StreamableHTTPServerTransport("/mcp");
await server.connect(transport);
await transport.handleRequest(req, res);
});
app.listen(3001);Tip:Use stdio for development and local tools. Use HTTP when you need to deploy your server to the cloud or share it with others.
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npx tsx server.ts