JSFiddle - React, Tailwind, and code Playground
HTML
<button type="button" data-params='{"locac":"reg","titulo":"Inserir Registro"}' class="btn btn-success inst">Inserir</button>
JavaScript
function fnc(){
var evt = (window.event ? window.event : event);
var elemento = evt.target;
var params = $(elemento).data('params');
alert(params.locac);
}
$('body').on('click','button.inst',fnc);