You can access the contents of a form in JavaScript by using the `FormData` constructor.

Here is an example on how you could access the contents of a form upon the user clicking on a button:
```javascript
const btn = document.getElementById("myButton");
const form = document.getElementById("myForm");
btn.addEventListener("click", () => { // listen for the click event
   const contents = new FormData(form);
});
```

you can then retrieve specific values like this:
```javascript
contents.get("inputName");
```

replace `inputName` with the value of the "name" attribute of your input
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