Hello World MCP Server

# Hello World MCP Server Welcome to the **Hello World MCP Server**! This project demonstrates how to set up a server using the [Model Context Protocol (MCP)](https://github.com/modelcontextprotocol/typescript-sdk) SDK. It includes tools, prompts, and endpoints for handling server-sent events (SSE) and messages. This project is part of the blog post: [Building a TypeScript MCP Server: A Guide for Integrating Existing Services](https://medium.com/@jageenshukla/building-a-typescript-mcp-server-a-guide-for-integrating-existing-services-5bde3fc13b23). Visit the blog to learn more about the concepts and implementation details behind this project. --- ## Features - **MCP Integration**: Uses the MCP SDK to create a server with tools and prompts. - **Express Framework**: Handles HTTP endpoints for SSE and message communication. - **Environment Configuration**: Uses `.env` files for easy configuration. - **TypeScript Support**: Fully typed codebase for better developer experience. --- ## Prerequisites Before you begin, ensure you have the following installed: 1. **Node.js** (v16 or higher) - [Download here](https://nodejs.org/) 2. **npm** (comes with Node.js) or **yarn** --- ## Getting Started Follow these steps to set up and run the project: ### 1. Clone the Repository If you haven't already, clone the repository to your local machine: ```bash git clone https://github.com/your-username/hello-world-mcp-server.git cd hello-world-mcp-server ``` ### 2. Install Dependencies Install the required dependencies using npm or yarn: ```bash npm install ``` or ```bash yarn install ``` ### 3. Configure Environment Variables The project uses a `.env` file to configure the server's port. A sample `.env.example` file is provided. 1. Copy the `.env.example` file to `.env`: ```bash cp .env.example .env ``` 2. Open the `.env` file and update the `PORT` variable if needed. The default is `4000`. ```env PORT=4000 ``` ### 4. Build the Project Compile the TypeScript code into JavaScript: ```bash npm run build ``` This will generate the compiled files in the `dist` directory. ### 5. Run the Server Start the server in production mode: ```bash npm start ``` Alternatively, for development mode with live reloading, use: ```bash npm run dev ``` --- ## Testing the Server ### 1. Using the MCP Inspector The MCP Inspector is a tool to test and inspect your MCP server. You can use it to verify that your tools and prompts are registered correctly. Run the following command to inspect your server: ```bash npx @modelcontextprotocol/inspector ./dist/server.js ``` This will open an interactive interface where you can test the tools and prompts registered in your server like below.  --- ## Project Structure Here’s an overview of the project structure: ``` hello-world-mcp-server/ ├── src/ │ ├── server.ts # Main server entry point │ ├── modules/ │ │ ├── tools.ts # Registers MCP tools │ │ ├── prompts.ts # Registers MCP prompts │ │ └── transports.ts # Handles SSE and message endpoints ├── .env # Environment variables ├── .env.example # Example environment variables ├── package.json # Project metadata and scripts ├── tsconfig.json # TypeScript configuration └── README.md # Project documentation ``` --- ## Troubleshooting ### Common Issues 1. **Port Already in Use**: If you see an error about the port being in use, update the `PORT` variable in the `.env` file. 2. **TypeScript Errors**: Ensure you’ve installed all dependencies and are using the correct Node.js version. ### Debugging Use the following command to debug the server: ```bash npm run dev ``` This will start the server with live reloading and detailed logs. --- ## Related Projects - [Ollama Pydantic Project](https://github.com/jageenshukla/ollama-pydantic-project): A counter project implementing an LLM agent that utilizes the tools developed in this project. Learn more about it in the blog post: [Integrating MCP Server with a Local LLM Chatbot](https://medium.com/@jageenshukla/ollama-pydantic-project-integrating-mcp-server-with-a-local-llm-chatbot-30e25becdaa2). --- ## Contributing Contributions are welcome! Feel free to open issues or submit pull requests. --- ## License This project is licensed under the MIT License. See the [LICENSE](LICENSE) file for details.