JSFiddle - React, Tailwind, and code Playground

HTML

<input type='text' name='input[][nome]' class='add-item'/>
<input type='text' name='input[][nome]' class='add-item'/>
<input type='text' name='input[][nome]' class='add-item'/>

JavaScript

$('.add-item').on('click',function(){
    var indice = $(this).index();
    alert(indice);
});