# Add a New Transformer (Server)
## Introduction
This document explains step by step how to add Transformers to the server side. All the information required for client-side or server-side configuration is provided.
## Procedure
To add a new Transformer in Tag Manager, perform the following steps:
**Step 1:** In the navigation panel, click ***Transformers*****.**
**Step 2:** Click the ***Add Transformer*** drop-down and select **For Server**.
**Step 3:** Under the ***Info*** section, in the ***Function Name*** field, enter the appropriate name.
**Note**: The Function name must always start with an alphabet, and can only contain letters, numbers and underscores.
**Step 4:** In the ***Description*** field, enter an appropriate description.
**Step 5:** Under the ***Function Arguments*** field, click **Add *****Arguments*****.**
**Step 5.1:** In the ***Name*** field, enter the appropriate name.
**Step 5.2:** Under the ***Value*** field, click ***Select Data Element***.
The ***Select Data Element***** panel** opens on the right side.
Two tabs are available:
* User-defined
* Default
You can select a data element from these tabs or use the search bar.
**Note:** Click the selected argument data element value. The data element details will appear in the right panel.
**Note:** To clear the selected data element value, click the small **X** icon next to it.
**Step 5.3:** The following checkboxes are available:
* Mandatory: Select this checkbox to make the argument required.
* URL Encode: Select this checkbox to encode the value for safe URL transmission.
* Hash (SHA256): Select this checkbox to hash the value using the SHA256 algorithm.
Note: To delete the Argument, click the **Delete** icon on the right-hand corner of the screen.
**Step 6:** To access the Argument, enter the code in the Code section. You can also test the function using the **Test Function** tab on the right-hand corner of the screen.
**Step 7:** Click the **Full Screen** icon  to expand the code and view it in full screen mode.
**Step 8:** Click **Test Function**. The **Test Function** panel opens.
**Step 9:** Click the **Select** dropdown and choose an input type:
* **Number** — Use this option if your function requires a numeric input.
* **String** — Use this option if your function requires text input.
* **Boolean** — Use this option if your function requires a true/false value.
* **JSON** — Use this option if your function requires structured data in JSON format.
**Step 10:** Enter the **Argument value** that corresponds to the selected input type.
**Step 11:** Navigate to the **Output** tab to view the result of the executed function.
**Step 12:** Click **Save** to save the Transformer details.
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