# Set field value to a constant

## <img src="/files/oKyEHkfLy1SGL6SKdFtz" alt="" data-size="line"> Set field value to a constant

### Description <a href="#description" id="description"></a>

The Set Field Value To A Constant transform replaces the value of a field with a hard coded constant value that you define.

| Hop Engine | <sup>✓</sup> |
| ---------- | ------------ |
| Spark      | ?            |
| Flink      | ?            |
| Dataflow   | ?            |

### Options

| Option                   | Description                                                                                                                                  |
| ------------------------ | -------------------------------------------------------------------------------------------------------------------------------------------- |
| Transform name           | Name of the transform this name has to be unique in a single pipeline.                                                                       |
| Use variable in constant | Select to use a variable replacement within a constant.                                                                                      |
| Field                    | Specify the field that contains the value you want to replace.                                                                               |
| Replace by value         | Specify the value that will replace the original field value specified.                                                                      |
| Conversion mask (Date)   | Specify a date format for the replaced field. See Common Formats for information on common valid date formats you can use in this transform. |
| Set empty string?        | Specify Y to allow an empty string when the value is empty; otherwise, a null value is used.                                                 |


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