JSFiddle - React, Tailwind, and code Playground

HTML

<input type="button" id="saveBtn" value="Save"/>
<input type="button" id="readBtn" value="Read"/>
<span id="content">
</span>

JavaScript

$("#saveBtn").click(function(){
    localStorage.setItem("hello", JSON.stringify(["hi", "sup"]));
});
                    
$("#readBtn").click(function(){
    var helloArray = JSON.parse(localStorage.getItem('hello'));
    var text = '';
    for (var i = 0; i < helloArray.length; i++) {
      text += helloArray[i];
    }
    $("#content").html(text);
});