PII Masking Patterns

Protect sensitive data in LLM observability pipelines with automated PII detection and redaction.

Overview

• Masking PII before logging prompts and responses
• Integrating with Langfuse tracing via mask callbacks
• Using Microsoft Presidio for enterprise-grade detection
• Implementing LLM Guard for input/output sanitization
• Pre-logging redaction with structlog/loguru

Quick Reference

Langfuse Mask Callback (Recommended)

import re
from langfuse import Langfuse