JSFiddle - React, Tailwind, and code Playground

by Alfie

HTML

<form id="userForm" action="xpto">
     <input type="text" name="form[data_nascimento_beneficiario_1]" value="testing" />
     <input type="submit" value="Continuar" />
</form>

JavaScript

alert($('input[name="form[data_nascimento_beneficiario_1]"]').length);