NiFi Ingest 25.4
NiFi Ingest

# base64_decode

Decodes a base64-encoded string.

## Syntax

    base64_decode( input )

## Arguments

Argument | Description
--- | ---
`input` | (string) The string to decode.

## Returns

(String). The decoded string.

If the input is not a valid base64-encoded string, the function returns `nil`.

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Version 25.4 | Last updated October 2025

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Product: Knowledge Discovery NiFi Ingest 25.4

Topic Title: base64_decode