## Input validation

Stripe elements validate customer input as it is typed.
To help your customers catch mistakes, listen to `change` events on an `Element` and display any errors.

### Display validation errors from an Element

```js
cardElement.on('change', function(event) {
  var displayError = document.getElementById('card-errors');
  if (event.error) {
    displayError.textContent = event.error.message;
  } else {
    displayError.textContent = '';
  }
});
```

```es_next
cardElement.on('change', ({error}) => {
  const displayError = document.getElementById('payment-errors');
  if (error) {
    displayError.textContent = error.message;
  }
});
```