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

# CVV Input

> Secure input for card security codes.

## \<primer-input-cvv>

Secure, PCI-compliant input for card security codes (CVV/CVC). Uses iframe for maximum security.

## Quick Reference

|                |                                      |
| -------------- | ------------------------------------ |
| **Parent**     | `<primer-card-form>`                 |
| **Properties** | `label`, `placeholder`, `aria-label` |
| **Features**   | Secure iframe, validation            |

***

## Examples

### Default

```html theme={"dark"}
<primer-card-form>
  <primer-input-cvv></primer-input-cvv>
</primer-card-form>
```

### Custom Labels

```html theme={"dark"}
<primer-input-cvv
  label="Security Code"
  placeholder="CVV"
  aria-label="Card security code"
></primer-input-cvv>
```

### Inline with Expiry

```html theme={"dark"}
<div style="display: flex; gap: 8px;">
  <primer-input-card-expiry></primer-input-card-expiry>
  <primer-input-cvv></primer-input-cvv>
</div>
```

***

## Properties

| Property      | Attribute     | Type     | Default          | Description         |
| ------------- | ------------- | -------- | ---------------- | ------------------- |
| `label`       | `label`       | `string` | `"CVV"`          | Label text          |
| `placeholder` | `placeholder` | `string` | `"123"`          | Placeholder text    |
| `ariaLabel`   | `aria-label`  | `string` | Value of `label` | Screen reader label |

***

## Validation

Validates:

* Required digits entered (3 for most networks, 4 for Amex)
* Only numeric characters

Errors display automatically on submit or blur.

***

## Dynamic Length (Amex)

The CVV field automatically adapts based on the card network detected by `<primer-input-card-number>`:

| Network                    | CVV length | Default placeholder |
| -------------------------- | ---------- | ------------------- |
| Visa, Mastercard, Discover | 3 digits   | `123`               |
| Amex                       | 4 digits   | `1234`              |

No configuration needed — length adjusts when the card number identifies the network.

***

## Events

`<primer-input-cvv>` does not emit its own events. Validation and submission are managed by the parent `<primer-card-form>`.

### Relevant Parent Events

| Event                 | Emitted by                                       | How it affects this input                                                             |
| --------------------- | ------------------------------------------------ | ------------------------------------------------------------------------------------- |
| `primer:card-submit`  | `<primer-card-form-submit>` or external dispatch | Triggers validation — if this input is invalid, an error message displays below it    |
| `primer:card-error`   | `<primer-card-form>`                             | Emitted when any card input fails validation — payload includes all validation errors |
| `primer:card-success` | `<primer-card-form>`                             | Emitted when the form submits successfully                                            |

### Reacting to card validation errors

```javascript theme={"dark"}
const cardForm = document.querySelector('primer-card-form');

cardForm.addEventListener('primer:card-error', (event) => {
  const { errors } = event.detail;
  errors.forEach(err => console.log(err.field, err.message));
});
```

***

## CSS Properties

This component uses the shared [Input Styling Tokens](/sdk/primer-checkout-web/styling-variables#input-styling-tokens).

### Typography

| Property                                | Description       | Default |
| --------------------------------------- | ----------------- | ------- |
| `--primer-typography-body-large-size`   | Input text size   | `16px`  |
| `--primer-typography-body-large-weight` | Input text weight | `400`   |
| `--primer-typography-body-small-size`   | Label text size   | `12px`  |

### Colors

| Property                          | Description            |
| --------------------------------- | ---------------------- |
| `--primer-color-text-primary`     | Input text color       |
| `--primer-color-text-placeholder` | Placeholder text color |
| `--primer-color-text-disabled`    | Disabled text color    |
| `--primer-color-text-negative`    | Error message color    |

### Border & Background

| Property                                     | Description         |
| -------------------------------------------- | ------------------- |
| `--primer-radius-small`                      | Input border radius |
| `--primer-color-border-outlined-default`     | Default border      |
| `--primer-color-border-outlined-focus`       | Focus border        |
| `--primer-color-border-outlined-error`       | Error border        |
| `--primer-color-background-outlined-default` | Default background  |

### Spacing

| Property                | Description                 | Default |
| ----------------------- | --------------------------- | ------- |
| `--primer-space-xsmall` | Gap between label and input | `4px`   |
| `--primer-space-medium` | Input padding               | `12px`  |

### Animation

| Property                      | Description         | Default                         |
| ----------------------------- | ------------------- | ------------------------------- |
| `--primer-animation-duration` | Transition duration | `200ms`                         |
| `--primer-animation-easing`   | Transition easing   | `cubic-bezier(0.44, 0, 0.4, 1)` |

***

## States

| State        | Description            | Visual Change                   |
| ------------ | ---------------------- | ------------------------------- |
| **Default**  | Initial state          | Standard border and background  |
| **Hover**    | Mouse over input       | Border darkens slightly         |
| **Focus**    | Input is focused       | Blue border, increased width    |
| **Filled**   | Valid CVV entered      | Standard appearance             |
| **Error**    | Invalid CVV length     | Red border, error message below |
| **Disabled** | Form or input disabled | Muted colors, no interaction    |

***

## Usage Guidelines

### Do

* Place inside `<primer-card-form>`
* Pair with `<primer-input-card-expiry>` in a flex row

### Don't

* Don't place outside card form context

***

## Content Guidelines

### Label

| Do                                       | Don't                                          |
| ---------------------------------------- | ---------------------------------------------- |
| "CVV" (universally recognized)           | "Card Verification Value" (too technical)      |
| "Security code" (accessible alternative) | "CVC" without also accepting "CVV" as an alias |

### Placeholder

| Do                                      | Don't                                                         |
| --------------------------------------- | ------------------------------------------------------------- |
| `123` (shows expected length)           | "Enter CVV" (redundant with label)                            |
| `1234` when Amex is detected (4 digits) | Always showing 3-digit placeholder regardless of card network |

### Error messages

| Do                                | Don't                                                  |
| --------------------------------- | ------------------------------------------------------ |
| "Enter your card's security code" | "Invalid"                                              |
| "CVV is incomplete"               | "Wrong CVV" (you can't know if it's wrong client-side) |

***

## See also

<CardGroup cols={2}>
  <Card title="primer-card-form" icon="credit-card" href="/sdk/primer-checkout-web/components/primer-card-form/primer-card-form">
    Parent container
  </Card>

  <Card title="primer-input-card-expiry" icon="cube" href="/sdk/primer-checkout-web/components/primer-card-form/primer-input-card-expiry">
    Expiry input
  </Card>

  <Card title="primer-input-card-number" icon="cube" href="/sdk/primer-checkout-web/components/primer-card-form/primer-input-card-number">
    Card number input
  </Card>
</CardGroup>