JSFiddle - React, Tailwind, and code Playground

HTML

<div class="link_contain" id="add_struct">
 
</div>
<script type="text/javascript">
base='<li class="item">'+
            '<a href="#structures" class="link" id="btn" >Otacos<i class="fas fa-sort-down"></i></a>'+
            '<div class="smenu">'+
            '<ul>'+
            '<li><div class="link" data-name="newsite" onclick="<?php $name_str="otacos" ?>"><i class="fas fa-plus"></i>Add new Marketsite</div></li>'+
            '</ul>'+
            '</div>'+
            '</li>';
        document.getElementById("add_struct").innerHTML=base;
</script>

JavaScript

myjson= { "nom": "TRUC", "prenom": "Muche"};
mystrjson= JSON.stringify (myjson);
console.log ( myjson);
console.log(mystrjson);