# ToLower(String str)

| Name                     | *ToLower*                                                 |
| ------------------------ | --------------------------------------------------------- |
| Applicable To (DataType) | String                                                    |
| Purpose                  | To convert the string argument into lowercase characters. |
| Description              | Converts the string argument into lowercase characters.   |
| Return Type              | String                                                    |
| Syntax                   | str \[System.String] – string which will be converted.    |

![properties](https://github.com/astera-software/Astera_Data_Stack_v9/blob/main/.gitbook/assets/properties%20\(5\).png)

## Example

In this example, we have a customer’s data in which we want to convert the *CustomerID* information into lower case. Map the *CustomerID* to the *str* data field under the *Input* node inside the function transformation object.

![dataflow](https://github.com/astera-software/Astera_Data_Stack_v9/blob/main/.gitbook/assets/dataflow%20\(6\).png)

Right-click on the header of function transformation object and select *Preview Output*. You can see that all the *CustomerIDs* have been converted into lower case.

![output](https://github.com/astera-software/Astera_Data_Stack_v9/blob/main/.gitbook/assets/output%20\(4\).png)