---
title: Fingerprint processor
description: Computes a hash of the document’s content. You can use this hash for content fingerprinting. The following example illustrates the use of the fingerprint...
url: https://www.elastic.co/elastic/docs-builder/docs/3016/reference/enrich-processor/fingerprint-processor
products:
  - Elasticsearch
---

# Fingerprint processor
Computes a hash of the document’s content. You can use this hash for [content fingerprinting](https://en.wikipedia.org/wiki/Fingerprint_(computing)).


| Name             | Required | Default       | Description                                                                                                                                                                                                                    |
|------------------|----------|---------------|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| `fields`         | yes      | n/a           | Array of fields to include in the fingerprint. For objects, the processor hashes both the field key andvalue. For other fields, the processor hashes only the field value.                                                     |
| `target_field`   | no       | `fingerprint` | Output field for the fingerprint.                                                                                                                                                                                              |
| `salt`           | no       | <none>        | [Salt value](https://en.wikipedia.org/wiki/Salt_(cryptography)) for the hash function.                                                                                                                                         |
| `method`         | no       | `SHA-1`       | The hash method used tocompute the fingerprint. Must be one of `MD5`, `SHA-1`, `SHA-256`, `SHA-512`, or`MurmurHash3`.                                                                                                          |
| `ignore_missing` | no       | `false`       | If `true`, the processorignores any missing `fields`. If all fields are missing, the processor silentlyexits without modifying the document.                                                                                   |
| `description`    | no       | -             | Description of the processor. Useful for describing the purpose of the processor or its configuration.                                                                                                                         |
| `if`             | no       | -             | Conditionally execute the processor. See [Conditionally run a processor](https://docs-v3-preview.elastic.dev/elastic/docs-builder/docs/3016/manage-data/ingest/transform-enrich/ingest-pipelines#conditionally-run-processor). |
| `ignore_failure` | no       | `false`       | Ignore failures for the processor. See [Handling pipeline failures](https://docs-v3-preview.elastic.dev/elastic/docs-builder/docs/3016/manage-data/ingest/transform-enrich/ingest-pipelines#handling-pipeline-failures).       |
| `on_failure`     | no       | -             | Handle failures for the processor. See [Handling pipeline failures](https://docs-v3-preview.elastic.dev/elastic/docs-builder/docs/3016/manage-data/ingest/transform-enrich/ingest-pipelines#handling-pipeline-failures).       |
| `tag`            | no       | -             | Identifier for the processor. Useful for debugging and metrics.                                                                                                                                                                |


## Example

The following example illustrates the use of the fingerprint processor:
```json

{
  "pipeline": {
    "processors": [
      {
        "fingerprint": {
          "fields": ["user"]
        }
      }
    ]
  },
  "docs": [
    {
      "_source": {
        "user": {
          "last_name": "Smith",
          "first_name": "John",
          "date_of_birth": "1980-01-15",
          "is_active": true
        }
      }
    }
  ]
}
```

Which produces the following result:
```json
{
  "docs": [
    {
      "doc": {
        ...
        "_source": {
          "fingerprint" : "WbSUPW4zY1PBPehh2AA/sSxiRjw=",
          "user" : {
            "last_name" : "Smith",
            "first_name" : "John",
            "date_of_birth" : "1980-01-15",
            "is_active" : true
          }
        }
      }
    }
  ]
}
```