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Reference

Collation
Description of collation fields as well as supported languages and associated locales for collation.
Connection Strings
The complete specification of the MongoDB connection string format that the drivers use to describe connections to MongoDB deployments.
Database Commands
Documentation of all MongoDB database commands operations, syntax, and use.
Default MongoDB Port
List of default ports used by MongoDB.
Default MongoDB Read Concerns/Write Concerns
List of default read and write concerns.
Error Codes
Details the error codes that MongoDB returns.
Glossary
A glossary of common terms and concepts specific to MongoDB.
Log Messages
Describes the components of log messages.
MongoDB Limits and Thresholds
A list of important limits and thresholds imposed by MongoDB.
MongoDB Wire Protocol
Description of the MongoDB Wire Protocol.
mongosh Methods
Documentation of JavaScript methods and helpers in mongosh.
Operators
Documentation of query, update, projection, and aggregation framework operators.
Server Sessions
Describes server sessions.
Slot-Based Query Execution Engine
Describes the slot-based query execution engine.
Stable API
Describes the Stable API.
System Collections
Describes the collections that MongoDB reserves for internal use.
mongo
Documentation of JavaScript methods and helpers in the legacy mongo shell.