Vue 2.0 Hello World

HTML

<script src="https://unpkg.com/vue"></script>

<div id="app">
  <p>{{ comp }}</p>
  <p>
    <input v-model="comp.name">
  </p>
</div>

JavaScript

new Vue({
  el: '#app',
  data: {
    json: '{"name":"Vasya"}'
  },
  computed: {
  	comp: { get(){
    		return JSON.parse(this.json)
      }, set(val) {
      	this.json = JSON.stringify(val)
      }
    }
  }
})