Edit in JSFiddle

<div id="app">
  <input type="checkbox" id="checkbox" v-model="checked">
  <label for="checkbox">{{ checked }}</label>
</div>
<script src="https://cdn.jsdelivr.net/npm/vue/dist/vue.js"></script>
var app = new Vue({
  el: '#app',
  data: {
    checked: true
  }
})