`fastmcp.server.middleware.logging`

Comprehensive logging middleware for FastMCP servers.

Functions

`default_serializer`

default_serializer(data: Any) -> str

The default serializer for Payloads in the logging middleware.

Classes

`BaseLoggingMiddleware`

Base class for logging middleware. Methods:

`on_message`

on_message(self, context: MiddlewareContext[Any], call_next: CallNext[Any, Any]) -> Any

Log messages for configured methods.

`LoggingMiddleware`

Middleware that provides comprehensive request and response logging. Logs all MCP messages with configurable detail levels. Useful for debugging, monitoring, and understanding server usage patterns.

`StructuredLoggingMiddleware`

Middleware that provides structured JSON logging for better log analysis. Outputs structured logs that are easier to parse and analyze with log aggregation tools like ELK stack, Splunk, or cloud logging services.

⌘I

fastmcp.apps

fastmcp.cli

fastmcp.client

fastmcp.experimental

fastmcp.prompts

fastmcp.resources

fastmcp.server

fastmcp.tools

fastmcp.utilities

logging

`fastmcp.server.middleware.logging`

Functions

`default_serializer`

Classes

`BaseLoggingMiddleware`

`on_message`

`LoggingMiddleware`

`StructuredLoggingMiddleware`

​fastmcp.server.middleware.logging

​Functions

​default_serializer

​Classes

​BaseLoggingMiddleware

​on_message

​LoggingMiddleware

​StructuredLoggingMiddleware

`fastmcp.server.middleware.logging`

Functions

`default_serializer`

Classes

`BaseLoggingMiddleware`

`on_message`

`LoggingMiddleware`

`StructuredLoggingMiddleware`