MongoDB MCP Server 🔌 MCP server Free

What it does

MongoDB MCP Server is MongoDB's official server for connecting AI agents to MongoDB databases and Atlas, MongoDB's cloud service. With a connection string, the agent can explore databases and collections, infer a collection's schema, run finds and aggregations, check indexes and query plans, and, if you allow it, insert, update or delete data. With Atlas service-account credentials, it can also manage Atlas itself: create projects and clusters, including free ones, set up database users and IP access lists, and read Performance Advisor suggestions. The project is Apache-2.0 licensed.

Tools it gives your agent

• Database: find, aggregate, count, collection-schema, collection-indexes, explain, export, plus insert, update, delete, create and drop tools
• Atlas: list and create projects and clusters, atlas-create-free-cluster, database users, access lists, alerts, Performance Advisor and Stream Processing
• Atlas Local: create and connect to local Atlas deployments
• Assistant: search MongoDB's documentation and knowledge base

Works with

The local server runs through npx and needs Node.js 22.13 or newer. It works with any MCP client, and MongoDB's docs cover Claude Desktop, Cursor, Codex, Devin and others. MongoDB also runs a hosted Atlas MCP server that you sign in to with OAuth. There are official plugins for Claude, Cursor, VS Code, Codex, Copilot CLI, Gemini and Grok: mongodb-atlas connects to the hosted server, and mongodb runs the local one.

How to connect

Interactive setup:

npx -y mongodb-mcp-server@latest setup

Or add it to your client's config, read-only:

{ "mcpServers": { "MongoDB": { "command": "npx", "args": ["-y", "mongodb-mcp-server@latest", "--readOnly"], "env": { "MDB_MCP_CONNECTION_STRING": "mongodb://localhost:27017/myDatabase" } } } }

Cost and limits

The server is free. Costs depend on your MongoDB deployment. Atlas has a free cluster tier, but tools such as atlas-create-cluster can create paid clusters.

Safety notes

Use --readOnly or MDB_MCP_READ_ONLY=true, which the README's own examples do by default. It blocks every create, update and delete tool. You can turn off specific tools or whole categories with --disabledTools. Give the Atlas service account the minimum roles it needs, and pass secrets as environment variables, not command-line arguments. The local server has no authentication, so never expose it on a network. Telemetry is on by default. Turn it off with MDB_MCP_TELEMETRY=disabled or DO_NOT_TRACK=1.