sankalp51/mcp-server

Data Analysis MCP Server

A simple Model Context Protocol (MCP) server that allows LLMs to create and manage user entries in a JSON file system database.

Features

• Create Users: Add new user entries with validation
• Retrieve Users: Get all users from the database
• JSON File Storage: Simple file-based data persistence
• Schema Validation: Zod-powered input validation
• MCP Compatible: Works with any MCP-compatible LLM client

Prerequisites

• Node.js (version 14 or higher)
• npm or yarn package manager

Installation

1. Clone or download this repository
2. Install dependencies:

npm install

Usage

Development Mode

Run the server in development mode with auto-recompilation:

npm run dev

Production Mode

1. Build the TypeScript files:

npm run build

2. Start the server:

npm start

Inspector Mode

Use the MCP Inspector to test and debug your server:

npm run inspector

This will start the server with the MCP Inspector interface for easy testing.

Server Capabilities

Tools

create-user

Creates a new user in the database.

Parameters:

• name (string, required): User's full name (minimum 1 character)
• email (string, required): Valid email address
• address (string, optional): User's address
• phone (string, optional): User's phone number

Example Usage:

{
  "name": "John Doe",
  "email": "john.doe@example.com",
  "address": "123 Main St, City, State",
  "phone": "+1-555-0123"
}

Resources

users://all

Retrieves all users from the database.

Resource URI: users://all MIME Type: application/json Description: Get all users from the database

Project Structure

├── server.ts              # Main server file
├── tools/
│   └── createUserTool.ts  # User creation tool implementation
├── resources/
│   └── getAllUsers.ts     # User retrieval resource implementation
├── build/                 # Compiled JavaScript files
├── package.json          # Project configuration
└── README.md            # This file

Data Schema

Users are validated against the following schema:

{
  name: string (required, min length: 1)
  email: string (required, valid email format)
  address?: string (optional)
  phone?: string (optional)
}

Configuration

The server runs with the following configuration:

• Name: data-analysis-server
• Version: 1.0.0
• Transport: Standard I/O (stdio)
• Capabilities: Tools and Resources enabled

Development

Building

npm run build

Type Checking

The project uses TypeScript for type safety. The main types are:

• User: Inferred from the Zod schema for user validation

Scripts

• npm start: Run the compiled server
• npm run build: Compile TypeScript to JavaScript
• npm run dev: Development mode with watch compilation
• npm run inspector: Run with MCP Inspector for debugging

Dependencies

Runtime Dependencies

• @modelcontextprotocol/sdk: MCP SDK for server implementation
• zod: Schema validation library

Development Dependencies

• @modelcontextprotocol/inspector: MCP debugging tool
• @types/node: Node.js type definitions
• typescript: TypeScript compiler

Connecting to LLM Clients

This server uses the Model Context Protocol standard and can be connected to any MCP-compatible LLM client. The server communicates via standard I/O (stdio) transport.

Error Handling

The server includes proper error handling for:

• Invalid user input (schema validation)
• File system operations
• Server startup errors

License

ISC License

Contributing

1. Fork the repository
2. Create a feature branch
3. Make your changes
4. Test with the MCP Inspector
5. Submit a pull request

Troubleshooting

Common Issues

1. Server won't start: Ensure all dependencies are installed with npm install
2. TypeScript errors: Run npm run build to check for compilation errors
3. Permission errors: Check file system permissions for the data storage location

Debug Mode

Use the inspector tool for detailed debugging:

npm run inspector

This provides a web interface to test your MCP server tools and resources.