> 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/functions/string/toupper-string-str.md).

# ToUpper (String str)

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

![properties](https://content.gitbook.com/content/zEifS4h8yurLAAwiGNX2/blobs/Hfo9wtG45DJZASc9Jdj6/properties.png)

## Example

In this example, we have customers data stored in an *Excel* sheet. We want to convert *CustomerContactName* into uppercase. So, we will map the *CustomerContactName* data field to *str* data field under the *Input* node inside the function transformation object.

![dataflow](https://content.gitbook.com/content/zEifS4h8yurLAAwiGNX2/blobs/musw4OorXiB4YJ8f8Kyq/dataflow.png)

Right-click on the function transformation object and select *Preview Output*. You can see that the value inside the data field has been converted into uppercase.

![output](https://content.gitbook.com/content/zEifS4h8yurLAAwiGNX2/blobs/nqSjoVPk3MkRqxzdXF67/output.png)


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