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Express MCP Server Echo

by jhgaylor

Express MCP Server

A stateless Model Context Protocol (MCP) server built with Express and TypeScript.

Features

  • Stateless MCP server implementation with modern Streamable HTTP transport
  • TypeScript for type safety
  • Express.js for HTTP handling

Requirements

  • Node.js 18+
  • npm or yarn

Installation

# Clone the repository (or download) git clone https://github.com/your-username/sample-express-mcp-server.git cd sample-express-mcp-server # Install dependencies npm install

Development

# Build the TypeScript code npm run build # Run in development mode with auto-reloading npm run dev # Run tests (when added) npm test

Server Structure

src/ ├── index.ts # Main application entry point └── server.ts # MCP server definition with resource, tool, and prompt

Available Functionality

This server implements a simple echo endpoint with three MCP components:

  • Resource: echo://{message} - Returns the message as a resource
  • Tool: echo - Echoes the provided message back as a tool response
  • Prompt: echo - Creates a user prompt with the provided message

MCP Protocol

This server implements the Model Context Protocol (MCP), a standardized way for LLMs to interact with external data and functionality. It exposes a stateless API endpoint that responds to JSON-RPC requests.

API Usage

Send a POST request to /mcp with a JSON-RPC payload:

Initialize
curl -X POST http://localhost:3001/mcp \ -H "Content-Type: application/json" \ -H "Accept: application/json" \ -H "Accept: text/event-stream" \ -d '{ "jsonrpc": "2.0", "id": 1, "method": "initialize", "params": { "protocolVersion": "2024-11-05", "capabilities": { "roots": { "listChanged": true }, "sampling": {} }, "clientInfo": { "name": "ExampleClient", "version": "1.0.0" } } }'
Call Echo Tool
curl -X POST http://localhost:3001/mcp \ -H "Content-Type: application/json" \ -H "Accept: application/json" \ -H "Accept: text/event-stream" \ -d '{ "jsonrpc": "2.0", "method": "tools/call", "params": { "name": "echo", "arguments": { "message": "Hello, World!" } }, "id": 1 }'

License

ISC

-
security - not tested
F
license - not found
-
quality - not tested

remote-capable server

The server can be hosted and run remotely because it primarily relies on remote services or has no dependency on the local environment.

A stateless Model Context Protocol server that implements a simple echo functionality with resource, tool, and prompt components, enabling LLMs to echo back messages through standardized MCP interactions.

  1. Features
    1. Requirements
      1. Installation
        1. Development
          1. Server Structure
            1. Available Functionality
              1. MCP Protocol
                1. API Usage
              2. License

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