> For the complete documentation index, see [llms.txt](https://documentation.astera.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://documentation.astera.com/astera-data-stack-v7/dataflows/transformations/apply-to-all-transformation.md).

# Apply To All Transformation

An ApplyToAll Transformation applies an Expression Transformation to all mapped elements. This transformation is useful when applying a common Expression Transformation to all data without the need to build multiple Expression Transformations.

## **Steps**

To use an ApplyToAll transformation, drag and drop the *ApplyToAll* from the *Transform* Group in the Flow toolbox to the flow designer.

![](/files/6ddBAGhV6hMyjCn1kTrX)

Map all the data to the *ApplyToAll* transformation created on the flow designer. These are all the data that a common expression will be applied to.

The properties window is also where the expression to be applied is specified. A parameter called *$FieldValue* will be available for an expression to be applied to. This will represent all of the data that was mapped to the ApplyToAll transformation.

## **Sample**

In this example, we are going to apply an Expression transformation to two string fields to convert them into lowercase values.

![](/files/dKKo6FFQKjtCpg8J9LxB)

The properties for ApplyToAll will give you the option to add an expression to a *$FieldValue* parameter. This will apply the expression to all of the mapped elements on the transformation.

![](/files/X7Cu0oM2baGotftFXcOD)

The *ApplyToAll* transformation takes the *MaritalStatus* and *Gender* field parameters and transforms them into lowercase values.


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