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58 lines
1.9 KiB
Text
58 lines
1.9 KiB
Text
---
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title: logging
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sidebarTitle: logging
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---
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# `fastmcp.server.middleware.logging`
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Comprehensive logging middleware for FastMCP servers.
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## Functions
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### `default_serializer` <sup><a href="https://github.com/jlowin/fastmcp/blob/main/src/fastmcp/server/middleware/logging.py#L15" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>
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```python
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default_serializer(data: Any) -> str
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```
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The default serializer for Payloads in the logging middleware.
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## Classes
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### `BaseLoggingMiddleware` <sup><a href="https://github.com/jlowin/fastmcp/blob/main/src/fastmcp/server/middleware/logging.py#L20" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>
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Base class for logging middleware.
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**Methods:**
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#### `on_message` <sup><a href="https://github.com/jlowin/fastmcp/blob/main/src/fastmcp/server/middleware/logging.py#L124" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>
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```python
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on_message(self, context: MiddlewareContext[Any], call_next: CallNext[Any, Any]) -> Any
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```
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Log messages for configured methods.
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### `LoggingMiddleware` <sup><a href="https://github.com/jlowin/fastmcp/blob/main/src/fastmcp/server/middleware/logging.py#L148" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>
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Middleware that provides comprehensive request and response logging.
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Logs all MCP messages with configurable detail levels. Useful for debugging,
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monitoring, and understanding server usage patterns.
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### `StructuredLoggingMiddleware` <sup><a href="https://github.com/jlowin/fastmcp/blob/main/src/fastmcp/server/middleware/logging.py#L203" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>
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Middleware that provides structured JSON logging for better log analysis.
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Outputs structured logs that are easier to parse and analyze with log
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aggregation tools like ELK stack, Splunk, or cloud logging services.
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