MongoDB MCP server

This MCP server enables querying MongoDB databases using the Model Context Protocol (MCP). It provides a simple interface for retrieving documents from MongoDB collections through the MCP standard.

Installation

To install the mongo-mcp-server, you'll need to have Node.js and npm installed on your system. Follow these steps:

# Clone the repository
git clone https://github.com/username/mongo-mcp-server.git

# Navigate to the project directory
cd mongo-mcp-server

# Install dependencies
npm install

Configuration

Before running the server, you need to configure your MongoDB connection. Create a configuration file or set environment variables:

# Set MongoDB connection string as an environment variable
export MONGODB_URI="mongodb://username:password@localhost:27017"

Usage

Starting the Server

Start the MCP server using the following command:

npm start

The server will start listening on the default port (typically 3000).

Available Tools

The mongo-mcp-server provides the following tools:

get-collection-documents

This tool retrieves all documents from a specified MongoDB collection.

Parameters

• collection: The name of the MongoDB collection to query
• database: The name of the MongoDB database containing the collection

Example Usage

To query documents from a MongoDB collection, send a request to the server with the following format:

{
  "tool": "get-collection-documents",
  "inputs": {
    "collection": "users",
    "database": "myapp"
  }
}

Response Format

The server will respond with a JSON object containing all documents from the specified collection:

{
  "result": [
    { "_id": "1", "name": "John Doe", "email": "[email protected]" },
    { "_id": "2", "name": "Jane Smith", "email": "[email protected]" }
  ]
}

Advanced Usage

Filtering Documents

Currently, the server returns all documents in a collection. For large collections, consider implementing pagination or filtering in your application logic.

Error Handling

The server returns standard HTTP status codes for different error conditions:

• 400: Bad Request (missing or invalid parameters)
• 404: Not Found (collection or database not found)
• 500: Internal Server Error (connection issues or other server problems)

How to install this MCP server

For Claude Code

To add this MCP server to Claude Code, run this command in your terminal:

claude mcp add-json "mongo-mcp-server" '{"command":"npx","args":["-y","mongo-mcp-server"]}'

See the official Claude Code MCP documentation for more details.

For Cursor

There are two ways to add an MCP server to Cursor. The most common way is to add the server globally in the ~/.cursor/mcp.json file so that it is available in all of your projects.

If you only need the server in a single project, you can add it to the project instead by creating or adding it to the .cursor/mcp.json file.

Adding an MCP server to Cursor globally

To add a global MCP server go to Cursor Settings > Tools & Integrations and click "New MCP Server".

When you click that button the ~/.cursor/mcp.json file will be opened and you can add your server like this:

{
    "mcpServers": {
        "mongo-mcp-server": {
            "command": "npx",
            "args": [
                "-y",
                "mongo-mcp-server"
            ]
        }
    }
}

Adding an MCP server to a project

To add an MCP server to a project you can create a new .cursor/mcp.json file or add it to the existing one. This will look exactly the same as the global MCP server example above.

How to use the MCP server

Once the server is installed, you might need to head back to Settings > MCP and click the refresh button.

The Cursor agent will then be able to see the available tools the added MCP server has available and will call them when it needs to.

You can also explicitly ask the agent to use the tool by mentioning the tool name and describing what the function does.

For Claude Desktop

To add this MCP server to Claude Desktop:

1. Find your configuration file:

• macOS: ~/Library/Application Support/Claude/claude_desktop_config.json
• Windows: %APPDATA%\Claude\claude_desktop_config.json
• Linux: ~/.config/Claude/claude_desktop_config.json

2. Add this to your configuration file:

{
    "mcpServers": {
        "mongo-mcp-server": {
            "command": "npx",
            "args": [
                "-y",
                "mongo-mcp-server"
            ]
        }
    }
}

3. Restart Claude Desktop for the changes to take effect