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

# Transformers

This section describes available transformation functions.

## phone\_number

**Description:**\
Formats phone numbers to a standard format.

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## postal\_code

**Description:**\
Formats postal codes to a standard format.

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## state\_code

**Description:**\
Formats state codes to a standard format.

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## strip

**Description:**\
Trims leading and trailing whitespace.

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## custom

**Description:**\
Custom transformation function.

**Additional:**\
Requires a `key` and a `transformFn` to modify the value.

Return `undefined` in `transformFn` to skip the transformation.