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Elastic Docs ›Fleet and Elastic Agent Guide [8.8] ›Define processors

Decode Base64 fields

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Decode Base64 fields

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The decode_base64_field processor specifies a field to base64 decode.

To overwrite fields, either rename the target field or use the drop_fields processor to drop the field, and then rename the field.

Example

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In this example, field1 is decoded in field2.

  - decode_base64_field:
      field:
        from: "field1"
        to: "field2"
      ignore_missing: false
      fail_on_error: true

Configuration settings

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Elastic Agent processors execute before ingest pipelines, which means that your processor configurations cannot refer to fields that are created by ingest pipelines or Logstash. For more limitations, refer to What are some limitations of using processors?

Name Required Default Description

field

Yes

Contains:

  • from: "old-key", where from is the origin
  • to: "new-key", where to is the target field name

ignore_missing

No

false

Whether to ignore missing keys. If true, missing keys that should be base64 decoded are ignored and no error is logged. If false, an error is logged and the behavior of fail_on_error is applied.

fail_on_error

No

true

Whether to fail if an error occurs. If true and an error occurs, an error is logged and the event is dropped. If false, an error is logged, but the event is not modified.

See Conditions for a list of supported conditions.

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