mcp mongo server

A Model Context Protocol server that provides access to MongoDB databases. This server enables LLMs to inspect collection schemas and execute MongoDB operations.

Demo

Features

Read-Only Mode

• Connect to MongoDB in read-only mode with --read-only or -r flag
• Prevents write operations (update, insert, createIndex)
• Uses MongoDB's secondary read preference for optimal read performance
• Provides additional safety for production database connections

Resources

• List and access collections via mongodb:// URIs
• Each collection has a name, description and schema
• JSON mime type for schema access

Tools

• query
• Execute MongoDB queries with optional execution plan analysis
• Input: Collection name, filter, projection, limit, explain options

• Returns query results or execution plan

• aggregate

• Execute MongoDB aggregation pipelines with optional execution plan analysis
• Input: Collection name, pipeline stages, explain options

• Returns aggregation results or execution plan

• update

• Update documents in a collection
• Input: Collection name, filter, update operations, upsert/multi options

• Returns update operation results

• serverInfo

• Get MongoDB server information and status
• Input: Optional debug info flag

• Returns version, storage engine, and server details

• insert

• Insert documents into a collection
• Input: Collection name, documents array, write options

• Returns insert operation results

• createIndex

• Create indexes on a collection
• Input: Collection name, index specifications, write options

• Returns index creation results

• count

• Count documents matching a query
• Input: Collection name, query filter, count options
• Returns document count

Prompts

• analyze_collection - Analyze collection structure and contents
• Input: Collection name
• Output: Insights about schema, data types, and statistics

Development

Install dependencies:

npm install

Build the server:

npm run build

For development with auto-rebuild:

npm run watch

Installation for Development

Using Claude Desktop

To use with Claude Desktop, add the server config:

On MacOS: ~/Library/Application Support/Claude/claude_desktop_config.json

On Windows: %APPDATA%/Claude/claude_desktop_config.json

{
  "mcpServers": {
    "mongodb": {
      "command": "node",
      "args": [
        "~/mcp-mongo-server/build/index.js",
        "mongodb://muhammed:[email protected]/namespace"
      ]
    },
    "mongodb-readonly": {
      "command": "node",
      "args": [
        "~/mcp-mongo-server/build/index.js",
        "mongodb://muhammed:[email protected]/namespace",
        "--read-only"
      ]
    }
  }
}

Debugging

Since MCP servers communicate over stdio, debugging can be challenging. We recommend using the MCP Inspector, which is available as a package script:

npm run inspector

The Inspector will provide a URL to access debugging tools in your browser.

Components

Resources

The server provides schema information for each collection in the database:

• Collection Schemas (mongodb://<host>/<collection>/schema)
• JSON schema information for each collection
• Includes field names and data types
• Automatically inferred from collection documents

Usage with Claude Desktop

To use this server with the Claude Desktop app, add the following configuration to the "mcpServers" section of your claude_desktop_config.json:

{
  "mcpServers": {
    "mongodb": {
      "command": "npx",
      "args": [
        "-y",
        "mcp-mongo-server",
        "mongodb://muhammed:[email protected]/sample_namespace"
      ]
    },
    "mongodb-readonly": {
      "command": "npx",
      "args": [
        "-y",
        "mcp-mongo-server",
        "mongodb://muhammed:[email protected]/sample_namespace",
        "--read-only"
      ]
    },
    "mongodb-github": {
      "command": "npx",
      "args": [
        "-y",
        "github:kiliczsh/mcp-mongo-server",
        "mongodb://muhammed:[email protected]/sample_namespace",
        "--read-only"
      ]
    }
  }
}

Installing via Smithery

To install MCP MongoDB Server for Claude Desktop automatically via Smithery:

npx -y @smithery/cli install mcp-mongo-server --client claude

Installing via mcp-get

You can install this package using mcp-get:

npx @michaellatman/mcp-get@latest install mcp-mongo-server

Replace /sample_namespace with your database name.

Using Read-Only Mode

You can connect to MongoDB in read-only mode by adding the --read-only or -r flag when starting the server. This is recommended when you need to protect your data from accidental writes or when connecting to production databases.

# Connect in read-only mode using the command line
npx mcp-mongo-server mongodb://user:[email protected]/database --read-only

When in read-only mode: 1. All write operations (update, insert, createIndex) will be blocked 2. The server connects using MongoDB's secondary read preference 3. The connection status indicates read-only mode is active 4. The ping and serverInfo responses include read-only status information

License

This MCP server is licensed under the MIT License. This means you are free to use, modify, and distribute the software, subject to the terms and conditions of the MIT License. For more details, please see the LICENSE file in the project repository.