JSFiddle - React, Tailwind, and code Playground

HTML

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/vue/2.4.2/vue.min.js"></script>
<div id="app">
    <h1>ID: {{ id }}</h1>
    <h1>Exam: {{ exam }}</h1>
    
    <!--  exam.questions array is undefined -->
    <!-- <h1>Questions length: {{ exam.questions.length }}</h1> -->
</div>

JavaScript

new Vue({
  el: '#app',
  data: {
    id: "1",
    exam: {}
  },
  created: function () {
  this.fetchData();
},
  methods: {
    fetchData: function () {
      $.get("https://dl.dropboxusercontent.com/s/15lkz66wy3fut03/data.json", (data) => {
        this.exam = data;
      });
    }
  }

});