> 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-v6/dataflows/transformations/apply-to-all-transformation.md).

# Apply To All Transformation

An ApplyToAll Transformation applies an [Expression Transformation](https://documentation.astera.com/v/astera-data-stack-v6/dataflows/transformations/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.

![](https://3768133094-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FH4WCHHphSt0ALtMJlqot%2Fuploads%2F7ZXa1GZxFhC03XweRFpt%2F0.png?alt=media)

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

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.

![](https://3768133094-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FH4WCHHphSt0ALtMJlqot%2Fuploads%2FqaODkqOk0BHHuVwU3b07%2F1.png?alt=media)

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.

![](https://3768133094-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FH4WCHHphSt0ALtMJlqot%2Fuploads%2FQb7HsmNhBNg7K3hpPcia%2F2.png?alt=media)

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


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