Vue Js Validate CVV Number

<!DOCTYPE html>
<html>

<body>
  <div id="app">
    <h3>Vue Js Validate CVV Number</h3>
    <label for="cvv">CVV Number:</label>
    <input type="text" id="cvv" v-model="cvv" @input="validateCVV" />
    <p v-if="!isValidCVV" class="error">Invalid CVV number.</p>
  </div>
  <script type="module">
    const app = Vue.createApp({
      data() {
        return {
          cvv: '',
          isValidCVV: true,
        };
      },
      methods: {
        validateCVV() {
          // Remove any non-digit characters
          const cleanedCVV = this.cvv.replace(/\D/g, '');

// CVV should be a 3 or 4 digit number
          const isValidLength = cleanedCVV.length === 3 || cleanedCVV.length === 4;

// Update the validity flag
          this.isValidCVV = isValidLength;
        },
      },
    });
    app.mount('#app');
  </script>
  <style>
    .error {
      color: red;
      font-weight: bold;
    }

#app {
      width: 400px;
      margin: 20px auto;
      box-shadow: 0 1px 2px 0 rgba(0, 0, 0, 0.12), 0 2px 4px 0 rgba(0, 0, 0, 0.24);
      text-align: center;
      padding: 20px
    }

label {
      display: block;
      margin-bottom: 5px;
    }

input[type="text"] {
      padding: 5px;
      border: 1px solid #ccc;
      border-radius: 3px;
      width: 200px;
    }

input[type="text"]:focus {
      outline: none;
      border-color: #007bff;
    }
  </style>
</body>

</html>