JSFiddle - React, Tailwind, and code Playground

HTML

<ul>
    <li class="one">Element One</li>
    <li class="two">Element Two</li>
    <li class="one">Element Three</li>
    <li class="two">Element Four</li>
    <li class="one">Element Five</li>
    <li class="two">Element Six</li>
</ul>

CSS

.one {
    background-color: yellow;
}
.two {
    background-color: blue;
}

JavaScript

var stringArray = $('.one, .two').map(function (i, v) {
                    return $(v).html();
                  }).get();
var jsonString = JSON.stringify(stringArray);

console.log(jsonString);