> ## Documentation Index
> Fetch the complete documentation index at: https://docs.kibocommerce.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Add Validator to Fields

> Learn how to add a validator to a content model's field in Kibo CMS.

A field validator helps you ensure the user input meets specific requirements and matches the expected format for a field.

In this tutorial, we will learn how to add validators to a content model's fields.
As an example, we will add validators to the **LONG TEXT** and **NUMBER** fields used in the **Product** content model that we created in the [Create Content Model](/pages/cms-create-content-model) tutorial.

## Step 1: Add `Required` and `Min length` validators to a LONG TEXT field

In this step we will:

* make the **Description** field required.
* set the minimum length for the input the **Description** field to **20 characters**.

1. From the **Side Menu**, Click **Content Modeling** > **Models**.

   > The **Content Models** screen opens.

2. Hover over the **Product** content model.

3. Click **Edit**.

   > Screen to configure the **Product** content model's fields opens.

4. Click the **Edit Field** icon on the **Description** field.

   > **Field Settings - Long Text** screen opens.

5. Click the **Validations** tab.

6. Enable the **Required** validation by toggling the **Enabled** button. This will make the **Description** field mandatory.

   > **Message** textbox will appear to set the error message.

7. In the **Message** textbox, type **Please enter the product description**.

8. Enable the **Min length** validation by toggling the **Enabled** button.

   > **Message** and **Value** textboxes will appear to set the error message and minimum value.

9. In the **Message** textbox, type **Description cannot be less than 20 characters**.

10. In the **Value** textbox, type **20**.

11. Click **Save Field**.

    > Screen to configure the **Product** content model's fields opens.

12. Click **Save**.

    > The message "Your content model was saved successfully!" displays.

## Step 2: Test the validators

1. On the screen to configure the **Product** content model's fields, click the **Preview** tab.

2. Click the **Description** textbox.

3. Click anywhere outside the **Description** textbox.

   > The message "Please enter the product description" appears.

4. In the **Description** textbox, type **Top sweatshirt**.

5. Click anywhere outside the **Description** textbox.

   > The message "Description cannot be less than 20 characters" appears.