W3Schools Tryit Editor

<!DOCTYPE html>
<html>
<head>
  <title>My first Vue page</title>
  <style>
    #app > div {
      display: inline-block;
      border: dashed black 1px;
      padding: 10px;
      background-color: lightgreen;
    }
    #app p {
      font-weight: bold;
      margin: 5px 0;
    }
  </style>
</head>
<body>

<h1>Example: Get the array element index with 'v-for'</h1>
<p>The 'v-for' directive is used to get the index of objects inside the 'manyFoods' array, together with the name and url of each food object.</p>

<div id="app">
  <div>
    <p v-for="(x, index) in manyFoods">
      {{ index }}: "{{ x.name }}", url: "{{ x.url }}" <br>
    </p>
  </div>
</div>

</body>
</html>