JSFiddle - React, Tailwind, and code Playground

HTML

<body>


<button onclick="showAlert()">Click me</button>
 
</body>

JavaScript

var book = [
  {
    "word" : "cuiller",
    "page" : 23
  },
  
  {
    "word" : "arbre ",
    "page" : 245
  }
];

thebook = JSON.parse(JSON.stringify(book));

window.showAlert = function() {
  alert(thebook[0].word);
}