JSFiddle - React, Tailwind, and code Playground

HTML

<script src="https://rawgithub.com/allmarkedup/purl/master/purl.js"></script>
<div id="accordion-63-52453407315c8" class="wk-accordion wk-accordion-default clearfix" data-widgetkit="accordion" data-options='{"style":"default","collapseall":1,"matchheight":0,"index":-1,"duration":500,"width":"auto","order":"default"}'>

JavaScript

var index1 = $.url('http://www.myurl.com?index=aasdf&next=123').param('next'); //get the query string

$('#accordion-63-52453407315c8').data('options').index = index1;// intialize data-options index with the value from url

alert($('#accordion-63-52453407315c8').data('options').index);