Japanese PII Pseudonymization Extension for Claude Code Workflows
DataAirlock helps you safely work with Claude Code on data containing personally identifiable information (PII). It replaces sensitive information with placeholders like [NAME_001], allowing you to share code and documents with AI assistants without exposing real personal data.
Features
Core Pseudonymization
Selection/Document — Pseudonymize selected text or entire documents
File/Folder — Batch process entire directories with one click
Bidirectional — Full restoration from placeholders to original values
Detected PII Types
Type
Examples
Names (Japanese)
山田太郎, 鈴木花子
Phone Numbers
03-1234-5678, 090-1234-5678
Email
user@example.com
Addresses
東京都新宿区西新宿1-2-3
My Number
1234-5678-9012
Date of Birth
1990/01/01, 平成2年1月1日
Claude Code Integration
Safe Backup — Original data moved to ~/DataAirlock/backups/
.ignore / .claudeignore Generation — Automatically hide original folders and mappings
Output Restoration — Apply mappings to Claude-generated files
Keyboard Shortcuts
Action
Shortcut
Pseudonymize Selection
Ctrl+Alt+P
Restore Selection
Ctrl+Alt+R
Workflow
【Pseudonymization】
1. Right-click folder → "DataAirlock: フォルダを仮名化"
2. Select output location
3. Choose "Backup and delete original (recommended)"
Result:
├── project/
│ └── data_pseudonymized/ ← Safe for Claude
└── ~/DataAirlock/backups/ ← Original data secured
【Working with Claude Code】
4. Open project in Claude Code
5. Claude sees only pseudonymized data
6. Claude generates code referencing [NAME_001], etc.
【Restoration】
7. Right-click output folder → "DataAirlock: フォルダを復元"
8. Select "Restore from backup"
9. Original data returns to project
【Output Restoration】
10. Right-click Claude's generated files → "DataAirlock: マッピングを適用"
11. Placeholders replaced with original values
Commands
Context Menu (Right-click)
Command
Target
Description
フォルダを仮名化
Folder
Pseudonymize all files in folder
フォルダを復元
Folder
Restore from backup or in-place
ファイルを仮名化
File
Pseudonymize single file
ファイルを復元
File
Restore single file
マッピングを適用
File/Folder
Apply mapping to Claude output
Command Palette
Command
Description
DataAirlock: 選択範囲を仮名化
Pseudonymize selected text
DataAirlock: 選択範囲を復元
Restore selected text
DataAirlock: ドキュメント全体を仮名化
Pseudonymize entire document
DataAirlock: ドキュメント全体を復元
Restore entire document
DataAirlock: Show Mapping
View current session mappings
DataAirlock: Clear Mapping
Clear session mappings
Settings
Setting
Default
Description
dataairlock.backupDirectory
~/DataAirlock/backups
Backup location
dataairlock.outputFolderSuffix
_pseudonymized
Suffix for output folders
dataairlock.fileExtensions
21 types
File types to process
dataairlock.autoBackup
true
Auto backup originals
dataairlock.highlightColor
rgba(255, 200, 0, 0.3)
PII highlight color
Security & Privacy
Fully local — No network communication at any point
No telemetry — No usage data collected
Local mapping — Mapping files stored locally, never uploaded
Disclaimer
This tool assists with pseudonymization but does not guarantee complete PII detection.
Pattern-based detection has inherent limitations. Some PII may not be detected.
Users are responsible for reviewing output before sharing with external services.
This extension is not a substitute for formal data protection review.
The developers assume no liability for data exposure from undetected PII.
Mapping files contain original PII. Treat them as confidential data.
By using this extension, you acknowledge that pseudonymization reduces — but does not eliminate — the risk of PII exposure.
