calendaryjs-plugin-ics

New to calendaryjs? Start with the core README — this plugin serializes its output.

Turn generated calendar occurrences into a standard .ics VCALENDAR that Apple Calendar, Google Calendar, Outlook and anything else can subscribe to. An edge integration — calendaryjs owns the calendar core; this only serializes its plain output, with zero runtime dependency.

Install

npm i calendaryjs calendaryjs-plugin-ics

Use it

Generate occurrences with calendaryjs, then pass them to toICS():

import { calendary } from "calendaryjs";
import { every, date } from "calendaryjs/builder";
import { toICS } from "calendaryjs-plugin-ics";

const cal = calendary();
cal.addGroup({
  id: "holidays",
  events: [every("year").on(date(12, 25)).title("Christmas")],
});

const events = cal.getEventsInRange("2026-01-01", "2026-12-31");
const ics = toICS(events, { calendarName: "Holidays" });
// → a VCALENDAR string: write to a .ics file or serve it from an endpoint

One VEVENT per occurrence (events come pre-expanded, so no RRULE) — lunar / hijri / formula dates and per-occurrence exceptions & overrideDates all export correctly. Reminders → VALARM, priority → PRIORITY, plus DESCRIPTION / LOCATION / URL / CATEGORIES / COLOR.

Reference

toICS(events, options?) → string; // a full VCALENDAR document

| Option | Notes | | -------------- | ----------------------------------------------------- | | prodId | PRODID | | calendarName | X-WR-CALNAME — the calendar's display name | | method | METHOD, e.g. "PUBLISH" | | dtstamp | fixed Date → byte-stable, diff-friendly output | | priorityMap | override priority → ICS PRIORITY (return 0 to omit) |

Also exported: eventToVEvent(event, options?) — a single VEVENT block (no wrapper).

License

MIT. This plugin requires the calendaryjs core, which is licensed PolyForm Noncommercial — so commercial use of the combined work requires a commercial license for the core. See Commercial licensing.