JSFiddle - React, Tailwind, and code Playground

HTML

<a id="obj-details" data-value="{city:'berlin', street: 'mozart', postal_code: '55555', country: 'DE'}">test</a>

JavaScript

$(document).ready(function(){
        var value = $("#obj-details").data('value');
        var obj = eval('(' +value + ')');
        
        var country = obj.country;
        alert(country );
});