Ask Claude to Sanitize Data by Replacing Real Values with Realistic Fakes

You need to share a database dump, paste a JSON response into a bug report, or create test fixtures from real data — but it's full of real names and emails. Claude sanitizes it while keeping everything structurally identical.

"Sanitize this data — replace all personal information with realistic fakes 
but keep the structure, types, and relationships intact:
[paste your data]"

Claude replaces PII while preserving everything that matters for debugging or testing:

// Before:
{"id": 1, "name": "John Smith", "email": "john@realcompany.com", "phone": "555-0123"}

// After:
{"id": 1, "name": "Sarah Chen", "email": "sarah@example.com", "phone": "555-0198"}

This works for any data format:

# SQL dumps
"Sanitize this SQL insert — replace customer names, emails, and 
addresses with fakes. Keep the order totals and dates real."

# API response samples
"Anonymize this API response for our documentation — remove any 
real user data but keep the response structure exactly the same"

# Log entries
"Sanitize these log lines — replace IP addresses, user IDs, and 
email addresses with fake values so I can share them in the bug report"

# CSV exports
"Replace all PII in this CSV with realistic fake data. Keep numeric 
columns like amounts and quantities unchanged."

You can control what gets sanitized:

# Keep some fields real
"Sanitize names and emails but keep dates, amounts, and status 
values unchanged — those are needed for debugging"

# Maintain relationships
"Sanitize this data but make sure the same original user always 
maps to the same fake name — so relationships stay consistent"

# Match the locale
"Replace with Japanese names and addresses — this data is for 
testing our i18n support"

Claude can also write a sanitization script for repeated use:

"Write a script that sanitizes a database export — I'll need to 
run this every time I pull production data for local development"

Real data is for production. Sanitized data is for everything else — let Claude strip the PII while keeping the structure that makes it useful.

via Claude Code