JSFiddle - React, Tailwind, and code Playground
HTML
<input type="checkbox" checked="true" />
<input type="checkbox" />
<input type="checkbox" />
JavaScript
$("input[type=checkbox]").each(function() {
var elem = $(this);
if (elem.is(":checked")) {
alert(elem + " is checked");
} else { alert('Not checked'); }
})