@nam088/mcp-mongodb

@nam088/mcp-mongodb

MongoDB plugin for Model Context Protocol (MCP) server.

Features

• 🔍 Query Documents: Find documents with flexible filtering, sorting, and projection
• 📊 Database Introspection: List databases, collections, indexes, and statistics
• 🔧 CRUD Operations: Insert, update, and delete documents
• 🚀 Aggregation Pipeline: Run complex aggregation queries
• 📈 Index Management: Create and manage indexes
• 🛡️ Type-Safe: Full TypeScript support with proper typing
• 🔒 Secure: Support for MongoDB authentication and SSL/TLS connections
• ⚡ Connection Pooling: Efficient connection management

Installation

npm install @nam088/mcp-mongodb

Configuration

Environment Variables

Configure your MongoDB connection using environment variables:

# Required
MONGODB_URI=mongodb://localhost:27017
MONGODB_DATABASE=your_database

# Optional
MONGODB_MODE=READONLY          # Plugin mode: READONLY or FULL

Plugin Configuration

import { MongoDBPlugin } from '@nam088/mcp-mongodb';

const plugin = new MongoDBPlugin({
  uri: 'mongodb://localhost:27017',
  database: 'your_database',
  mode: 'READONLY', // or 'FULL'
  options: {
    // MongoDB client options
    maxPoolSize: 10,
    minPoolSize: 0,
  }
});

MongoDB Atlas Configuration

For MongoDB Atlas (cloud):

MONGODB_URI=mongodb+srv://username:[e-mail]
MONGODB_DATABASE=your_database

Usage

As Standalone MCP Server

Create mcp-config.json:

{
  "mcpServers": {
    "mongodb": {
      "command": "npx",
      "args": [
        "-y",
        "@nam088/mcp-mongodb"
      ],
      "env": {
        "MONGODB_URI": "mongodb://localhost:27017",
        "MONGODB_DATABASE": "your_database",
        "MONGODB_MODE": "READONLY"
      }
    }
  }
}

As Plugin in Your MCP Server

import { McpServer } from '@modelcontextprotocol/sdk/server/mcp.js';
import { StdioServerTransport } from '@modelcontextprotocol/sdk/server/stdio.js';
import { PluginRegistry } from '@nam088/mcp-core';
import { MongoDBPlugin } from '@nam088/mcp-mongodb';

const server = new McpServer(
  { name: 'my-server', version: '1.0.0' },
  { capabilities: { tools: {} } }
);

const registry = new PluginRegistry(server);
await registry.registerPlugin(MongoDBPlugin);

const transport = new StdioServerTransport();
await server.connect(transport);

Available Tools

Read-Only Tools (READONLY mode)

• mongodb_find: Find documents in a collection
• mongodb_count: Count documents in a collection
• mongodb_aggregate: Run aggregation pipeline
• mongodb_list_databases: List all databases
• mongodb_list_collections: List collections in a database
• mongodb_collection_stats: Get collection statistics
• mongodb_list_indexes: List indexes on a collection
• mongodb_server_status: Get server status information

Write Tools (FULL mode only)

• mongodb_insert_one: Insert a single document
• mongodb_insert_many: Insert multiple documents
• mongodb_update_one: Update a single document
• mongodb_update_many: Update multiple documents
• mongodb_delete_one: Delete a single document
• mongodb_delete_many: Delete multiple documents
• mongodb_create_index: Create an index
• mongodb_drop_index: Drop an index

Plugin Modes

READONLY Mode (Default)

Only read operations are allowed. Safe for production use.

MONGODB_MODE=READONLY

FULL Mode

All operations including writes are allowed. Use with caution.

MONGODB_MODE=FULL

Examples

Find Documents

// Tool: mongodb_find
{
  "collection": "users",
  "filter": {
    "age": { "$gte": 18 },
    "status": "active"
  },
  "projection": {
    "name": 1,
    "email": 1,
    "_id": 0
  },
  "sort": {
    "name": 1
  },
  "limit": 10
}

Insert Document (FULL mode)

// Tool: mongodb_insert_one
{
  "collection": "users",
  "document": {
    "name": "John Doe",
    "email": "[e-mail]",
    "age": 30,
    "status": "active"
  }
}

Update Documents (FULL mode)

// Tool: mongodb_update_many
{
  "collection": "users",
  "filter": {
    "status": "inactive"
  },
  "update": {
    "$set": {
      "status": "archived"
    }
  }
}

Aggregation Pipeline

// Tool: mongodb_aggregate
{
  "collection": "orders",
  "pipeline": [
    {
      "$match": {
        "status": "completed"
      }
    },
    {
      "$group": {
        "_id": "$userId",
        "totalSpent": { "$sum": "$amount" },
        "orderCount": { "$sum": 1 }
      }
    },
    {
      "$sort": {
        "totalSpent": -1
      }
    },
    {
      "$limit": 10
    }
  ]
}

Create Index (FULL mode)

// Tool: mongodb_create_index
{
  "collection": "users",
  "keys": {
    "email": 1
  },
  "options": {
    "unique": true,
    "name": "email_unique"
  }
}

List Collections

// Tool: mongodb_list_collections
{
  "database": "mydb"
}

Get Collection Statistics

// Tool: mongodb_collection_stats
{
  "collection": "users",
  "database": "mydb"
}

Security Best Practices

• Use Encrypted Connections: Use mongodb+srv:// or configure SSL/TLS
• Limit Permissions: Use database users with minimal required permissions
• Use READONLY Mode: For most use cases, READONLY mode is sufficient
• Validate Input: MongoDB operators like $where can be dangerous
• Connection Pooling: Configure appropriate pool sizes for your workload
• Network Security: Use VPN or IP whitelisting for remote connections

Type Safety

This plugin is fully typed with TypeScript. All query results and configurations use proper types from the mongodb library, ensuring type safety throughout your application.

import type {
  MongoDBPluginConfig,
  MongoDBQueryResult,
  MongoDBInsertResult,
  MongoDBUpdateResult,
  MongoDBDeleteResult
} from '@nam088/mcp-mongodb';

Requirements

• Node.js >= 18
• MongoDB 4.0 or later (including MongoDB Atlas)
• Network access to MongoDB instance

License

MIT

Author

nam088

Support

For issues and questions, please visit the GitHub repository.