JSFiddle - React, Tailwind, and code Playground

JavaScript

function storageEnabled() {
    try {
        localStorage.setItem("__test", "data");
    } catch (e) {
        if (/QUOTA_?EXCEEDED/i.test(e.name)) {
            return false;
        }
    }
    return true;
}

if (!storageEnabled()) alert('localStorage not enabled');