Saved from https://www.sohamkamani.com/blog/javascript-localstorage-with-ttl-expiry/

getWithExpiry

function getWithExpiry(key) {
	const itemStr = localStorage.getItem(key)
	// if the item doesn't exist, return null
	if (!itemStr) {
		return null
	}
	const item = JSON.parse(itemStr)
	const now = new Date()
	// compare the expiry time of the item with the current time
	if (now.getTime() > item.expiry) {
		// If the item is expired, delete the item from storage
		// and return null
		localStorage.removeItem(key)
		return null
	}
	return item.value
}