mcp-mongo-server

Overview

The MCP MongoDB Server provides a standardized interface for LLMs to interact with MongoDB databases. It offers smart ObjectId handling, read-only mode protection, automatic collection schema detection, and full MongoDB query and aggregation pipeline support. The server allows both read and write operations (when not in read-only mode) and provides collection completions for better LLM integration.

Try asking AI

After installing, here are 5 things you can ask your AI assistant:

• query

  Execute MongoDB queries against collections

  Try:Find all documents in users collectionTry:Get products where price > 100
• aggregate

  Run MongoDB aggregation pipelines

  Try:Group orders by customer and calculate totalTry:Find average price per category
• insert

  Insert documents into MongoDB collections

  Try:Add new user to users collectionTry:Insert product data with stock count
• update

  Update documents in MongoDB collections

  Try:Set user status to active where role=adminTry:Increment product quantity by 1
• list_collections

  List all collections in the database

  Try:Show all collections in my databaseTry:What collections exist in this database?
• schema_inference

  Infer collection schema from sample documents

  Try:Show schema of orders collectionTry:What fields are in the products collection?
• create_index

  Create indexes on collection fields

  Try:Create index on email field in usersTry:Add compound index to orders collection
• explain_plan

  Get query execution plan for MongoDB queries

  Try:Explain how this query will be executedTry:Show the plan for finding recent orders
• count_documents

  Count documents matching a query filter

  Try:How many users have status=activeTry:Count documents in orders collection
• distinct

  Get distinct values from a field in a collection

  Try:Show all unique categories in productsTry:List distinct countries from users collection
• drop_collection

  Remove a collection from the database

  Try:Delete the temporary_logs collectionTry:Drop the obsolete backup collection
• list_databases

  List all available databases

  Try:Show all databases on this serverTry:What databases can I access?

Comparable tools

Installation

npx -y mcp-mongo-server mongodb://localhost:27017/database

# Start server with MongoDB URI
npx -y mcp-mongo-server mongodb://user:password@localhost:27017/database

# Connect in read-only mode
npx -y mcp-mongo-server mongodb://user:password@localhost:27017/database --read-only

{
  "mcpServers": {
    "mongo": {
      "command": "npx",
      "args": ["-y", "mcp-mongo-server", "mongodb://localhost:27017/database"]
    }
  }
}

FAQ

Is write operation support available?

Yes, the server supports insert, update, and index creation operations unless it's running in read-only mode.

How does the schema inference work?

The server automatically detects collection schemas by analyzing document samples in the collection.

On Hacker News

Recent discussion from the developer community.

• Show HN: MongoDB MCP Server▲ 3💬 2
  Story by kilic · 2025-03-29

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