MongoDB MCP Server

MongoDB

MongoDB stores data in databases → collections → documents. Documents are JSON-like with _id. Works with Atlas, self-hosted, DocumentDB, Cosmos DB MongoDB API. Connection string format: mongodb+srv:// or mongodb://.

Data Model

• Databases — namespaces that contain one or more collections.
• Collections — document containers; every query targets a collection name explicitly.
• Documents — BSON payloads keyed by _id (ObjectIds surface as _id.$oid in JSON). Stable reads use handles like mongodb:document:{collection}:{_id}.
• Queries — native MongoDB filter documents ({} for full scans, field matchers, $gte ranges, etc.) with sensible limits.

Two credential field setups

Gotchas

• Resource id format: mongodb:document:{collection}:{document_id}. The document_id is typically the _id.$oid value.
• Query syntax: Use valid MongoDB query JSON. For ObjectId, use {"_id": {"$oid": "..."}}.
• Local MongoDB: Use the Local MongoDB on this computer setup for localhost — not a connection string with localhost in it.
• Atlas connection: Use mongodb+srv://cluster.mongodb.net/ with username:password. Network access must allow your IP.