remote-mcp-server-nodejs

A Node.js implementation of a remote Model Context Protocol (MCP) server, providing both SSE and streamable HTTP transports for MCP clients.

Features

• Express-based API: RESTful endpoints for MCP communication
• SSE and Streamable HTTP: Supports both Server-Sent Events and streamable HTTP transports
• TypeScript: Written in TypeScript for type safety
• Environment Configuration: Uses .env for configuration

Project Structure

• src/constant.ts – Project constants (server/tool names, descriptions, error messages)
• src/index.ts – Main entry point, sets up Express server and MCP transports
• src/server.ts – Defines the MCP server and tools
• package.json – Project metadata, scripts, dependencies
• tsconfig.json – TypeScript configuration
• .env – Environment variables (e.g., PORT)

Getting Started

Prerequisites

• Node.js (v14 or higher recommended)
• npm or yarn

Installation

Clone the repository and install dependencies:

git clone <your-repo-url>
cd remote-mcp-server-nodejs
npm install

Configuration

Create a .env file in the root directory (see .env.example if available):

PORT=3000

Build

npm run build

Run

npm start

The server will start on the port specified in .env (default: 3000).

API Endpoints

• GET /sse – Establishes an SSE connection for MCP
• POST /messages?sessionId=... – Sends a message to an SSE session
• ALL /mcp – Handles MCP requests via streamable HTTP
• GET / – Health check (returns welcome message)

Example MCP Tool

The server registers a tool named say-greeting that returns a greeting message for the provided input.

Using the MCP Tool

You can connect to this MCP server using any MCP-compatible client. For example, with VS Code's Model Context Protocol extension, configure .vscode/mcp.json as follows:

{
    "servers": {
        "my-mcp-server-51ba9d8e": {
            "url": "http://localhost:3000/mcp"
        }
    }
}

After configuration, you can invoke the say-greeting tool by sending a request with an input string. Example request:

{
  "jsonrpc": "2.0",
  "method": "say-greeting",
  "params": { "input": "World" },
  "id": 1
}

Example response:

{
  "jsonrpc": "2.0",
  "result": {
    "content": [
      { "type": "text", "text": "Hello, World!" }
    ]
  },
  "id": 1
}

You can use tools like curl, Postman, or any MCP client to interact with the server.

Scripts

• npm run build – Compile TypeScript to JavaScript
• npm run start – Start the server
• npm run watch – Watch files and rebuild on changes

Development

TypeScript source is in the src/ directory. Compiled output is in dist/.

License

MIT