> ## Documentation Index
> Fetch the complete documentation index at: https://pathlit.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

# PII Deanonymizer Node

> Restore original data from anonymized text using deanonymization keys

## Overview

The PII Deanonymizer Node restores original personally identifiable information (PII) from anonymized text. This node enables you to:

* Reverse anonymization performed by the PII Anonymizer node
* Restore encrypted PII values to their original form
* Reapply placeholder mappings
* Safely process and then restore sensitive data

## Configuration Parameters

### Node Configuration

This node requires two inputs to function:

1. **Anonymized Text** (input port): The text that was previously anonymized
2. **Deanonymization Info** (secrets port): The JSON object containing the encryption key, entity mappings, and placeholders from the PII Anonymizer node

<Warning>
  The deanonymization secrets must be stored securely and only used when necessary. Unauthorized access to these secrets can compromise privacy protections.
</Warning>

## Expected Inputs and Outputs

* **Inputs**:

  * **input**: Anonymized text with PII placeholders
  * **secrets**: JSON deanonymization information from PII Anonymizer node

* **Outputs**:

  * **output**: Original text with PII restored

## Use Case Examples

1. **Secure Processing Pipeline**:

   Anonymize data for processing through external systems, then deanonymize results before storing in your secure database.

2. **Privacy-Safe AI Analysis**:

   Send anonymized data to AI models for analysis, then restore original PII in the final output for authorized users.

3. **Audit Trail Recovery**:

   Maintain anonymized audit logs but allow authorized personnel to deanonymize specific entries when needed.

## Error Handling and Troubleshooting

* **Invalid Deanonymization Info**:

  Ensure the secrets JSON from the PII Anonymizer node is passed correctly without modification.

* **Missing Key**:

  The encryption key must be present in the deanonymization info. If missing, the original data cannot be restored.

* **Non-Invertible Operations**:

  Only encrypted PII can be fully restored. Other anonymization methods (like hashing) cannot be reversed.

If you encounter any issues not covered in this documentation, please reach out to our [support team](mailto:dev@pathlit.ai) for assistance.

## Relevant Nodes

<CardGroup>
  <Card title="PII Anonymizer Node" href="/docs/nodes/pii-anonymizer">
    Anonymize sensitive data before processing
  </Card>

  <Card title="LLM Node" href="/docs/nodes/llm">
    Process data between anonymization steps
  </Card>

  <Card title="Conditional Node" href="/docs/nodes/conditional">
    Control when deanonymization occurs
  </Card>
</CardGroup>