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MCP Hub

by arberrexhepi
GitHub
TypeScript
Apache 2.0
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mcp-hub

Host an express app of streamablehttp and stdio MCP servers that you can use from your own website. (comes with a mini chat dialog to check responses)

Table of Contents

Features

  • Streamable HTTP MCP transport server built on Model Context Protocol SDK
  • Demo stdio MCP transport server
  • Built-in demo tool (echo) for testing
  • Express façade handling JSON-RPC at /mcp and health checks at /health
  • Mini front-end chat UI to test MCP responses

Prerequisites

  • Node.js v16 or higher
  • npm (included with Node.js)

Installation

  1. Clone the repository:
    git clone https://github.com/arberrexhepi/mcp-hub.git cd mcp-hub
  2. Install root dependencies in root:
    npm install
  3. Install hub and server dependencies:
    cd hub && npm install && cd ..

Configuration

Create environment variable files in both hub/ and server/ directories:

hub/.env

PORT=4000 HOST=localhost MCP_REQUIRE_AUTH=false # set to 'true' to require Bearer auth NOTE: Work in Progress GITHUB_API_KEY= # optional: GitHub Token for tool examples

server/.env

PORT=3500 CLIENT_ORIGIN=http://localhost:3000 MCP_ENDPOINT=http://localhost:4000/mcp OPENAI_API_KEY=YOUR_OPENAI_API_KEY

Usage

  1. Build and start the MCP hub server:
    npm run start:hub
  2. Start the front-end proxy server:
    npm run start:server
  3. Open your browser at http://localhost:3000 to access the chat UI.
  4. The hub JSON-RPC endpoint is available at http://localhost:4000/mcp.

Directory Structure

├── LICENSE ├── package.json # root package config and scripts ├── README.md ├── hub/ # MCP hub server │ ├── package.json │ ├── tsconfig.json │ ├── src/ (TypeScript sources output to dist/) │ ├── installToolsFeature.ts │ ├── bridgeBuilder.ts │ ├── bridgeHttp.ts │ ├── bridgeStdio.ts │ └── hub.ts ├── server/ # proxy and front-end assets │ ├── index.js │ ├── extractContent.js │ └── public/ │ ├── index.html │ ├── css/ │ │ └── styles.css │ └── js/ │ └── chat.js └── hub/bridges/ # sample tool definitions └── hub.yaml

Scripts

All scripts are defined in the root package.json:

  • npm run build : Compile TypeScript in hub and copy bridge files
  • npm run copy:bridges: Copy bridge YAML definitions to hub/dist
  • npm run start:hub : Build then run the MCP hub server
  • npm run start:server: Run the Express static server with chat UI

License

  • This project is licensed under the Apache License 2.0. See the LICENSE file for details.

This server cannot be installed

-
security - not tested
A
license - permissive license
-
quality - not tested

An Express server implementation of Model Context Protocol that allows websites to connect to LLMs through streamable HTTP and stdio transports, with a built-in chat UI for testing responses.

  1. Table of Contents
    1. Features
      1. Prerequisites
        1. Installation
          1. Configuration
            1. hub/.env
            2. server/.env
          2. Usage
            1. Directory Structure
              1. Scripts
                1. License

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