JSFiddle - React, Tailwind, and code Playground
HTML
<textarea id="in"></textarea><br />
<button onClick="inData()">Input</button>
JavaScript
function inData() {
var Data = $("#in").val();
var rawData = Data.split(/\n/);
localStorage.setItem("DataArray", rawData);
var outData = localStorage.getItem("DataArray");
//alert(rawData[1]);
}