Express MCP Server Echo

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

This server cannot be installed

security - not tested

license - not found

quality - not tested

How are these scores calculated?

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.

Related MCP Servers

Shell MCP Server
odysseus0
-
security
F
license
-
quality
A Model Context Protocol server that allows LLMs to execute shell commands and receive their output in a controlled manner.
Last updated -
Python
MCP Ethers Wallet
crazyrabbitLTC
A
security
A
license
A
quality
A Model Context Protocol server that gives LLMs the ability to interact with Ethereum networks, manage wallets, query blockchain data, and execute smart contract operations through a standardized interface.
Last updated -
31
323
2
TypeScript
MIT License
MCP Server Example
alejandro-ao
A
security
A
license
A
quality
An educational implementation of a Model Context Protocol server that demonstrates how to build a functional MCP server for integrating with various LLM clients like Claude Desktop.
Last updated -
1
88
Python
MIT License
Echo MCP Server
piebro
A
security
A
license
A
quality
A simple server implementing the Model Context Protocol (MCP) that echoes messages back, designed for testing MCP clients.
Last updated -
1
Python
MIT License

View all related MCP servers

Express MCP Server Echo