First

htdocs/cookie.mjs

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+// https://stackoverflow.com/a/24103596
+// https://www.quirksmode.org/js/cookies.html
+
+export function set(name, value, days) {
+	var expires = '';
+	if(days) {
+		var date = new Date();
+		date.setTime(date.getTime() + (days*24*60*60*1000));
+		expires = '; expires=' + date.toUTCString();
+	}
+	document.cookie = name + '=' + (value || '')  + expires + '; path=/';
+}
+
+export function get(name) {
+	var nameEQ = name + '=';
+	var ca = document.cookie.split(';');
+	for(var i = 0; i < ca.length; i++) {
+		var c = ca[i];
+		while(c.charAt(0)==' ') c = c.substring(1, c.length);
+		if(c.indexOf(nameEQ) == 0) return c.substring(nameEQ.length, c.length);
+	}
+	return null;
+}
+
+export function reset(name) {   
+	document.cookie = name +'=; Path=/; Expires=Thu, 01 Jan 1970 00:00:01 GMT;';
+}
+
+export default { set, get, reset };