n8n-nodes-anonymizer

This is an n8n community node that provides privacy-preserving PII anonymization for LLM integrations using the Proxy Sandwich pattern.

It anonymizes Personally Identifiable Information (PII) before sending text to LLMs and restores original values afterward, ensuring sensitive data never reaches external APIs.

n8n is a fair-code licensed workflow automation platform.

Operations

Anonymize

Detects and replaces PII with tokenized placeholders. Supports both plain text and JSON input.

Detected entity types:

| Entity | Detection Method | Validation | |---|---|---| | Email | Regex | RFC 5322 | | Credit Card | Regex | Luhn checksum | | IBAN | Regex | ISO 13616 mod-97 | | DNI (Spain) | Regex | Letter mod-23 | | Phone | Regex | Digit count heuristic | | IP Address | Regex | Octet range | | Person Name | NLP (compromise) | Length + stopword filter | | Organization | NLP (compromise) | Length + stopword filter | | Location | NLP (compromise) | Length + stopword filter |

Example:

• Input: "Contact John at [email protected]"
• Output text: "Contact {{NAME_1}} at {{EMAIL_1}}"
• Output vault: {"{{NAME_1}}": "John", "{{EMAIL_1}}": "[email protected]"}

Restore

Replaces anonymized tokens back with original values using the Mapping Vault from the Anonymize step.

Usage (Proxy Sandwich Pattern)

1. Anonymizer (Anonymize) → receives user text, outputs anonymized text + vault
2. LLM Node (GPT, Claude, etc.) → processes anonymized text
3. Anonymizer (Restore) → receives LLM response + vault, outputs restored text

The LLM never sees real PII. The user gets fully contextualized output.

Installation

Follow the n8n community nodes installation guide.

Install via npm:

npm install n8n-nodes-anonymizer

Compatibility

• n8n >= 1.0.0
• Node.js >= 18.0.0

Resources

• n8n community nodes docs

License

MIT