If your application requires complex logic like recurring events, timezones, or alarms, using a dedicated library is safer and saves development time.
: Highly popular and supports Node.js and browsers. It handles complex recurrences and is regularly updated. download icalendar javascript
For simple use cases, you can build the string manually and use a Blob object to trigger the download. javascript If your application requires complex logic like recurring
and END:VEVENT : Defines a specific event within the calendar. SUMMARY : The title of the event. For simple use cases, you can build the
function downloadICS() const event = title: "Project Kickoff", start: "20260515T090000Z", end: "20260515T100000Z", description: "Initial meeting with the dev team.", location: "Online" ; const icsData = [ "BEGIN:VCALENDAR", "VERSION:2.0", "PRODID:-//Your Company//NONSGML v1.0//EN", "BEGIN:VEVENT", `UID:$Date.now()@yourdomain.com`, `DTSTAMP:$new Date().toISOString().replace(/[-:]`, `DTSTART:$event.start`, `DTEND:$event.end`, `SUMMARY:$event.title`, `DESCRIPTION:$event.description`, `LOCATION:$event.location`, "END:VEVENT", "END:VCALENDAR" ].join("\r\n"); // Create a Blob and trigger download const blob = new Blob([icsData], type: "text/calendar;charset=utf-8" ); const url = window.URL.createObjectURL(blob); const link = document.createElement("a"); link.href = url; link.setAttribute("download", "event.ics"); document.body.appendChild(link); link.click(); // Clean up window.URL.revokeObjectURL(url); document.body.removeChild(link); Use code with caution.
Generating and downloading iCalendar (.ics) files directly in the browser is a common requirement for event-driven web applications. This guide covers how to create RFC-compliant calendar data and trigger a file download using modern JavaScript. 1. Understanding the iCalendar (.ics) Format
: The specification requires CRLF ( \r\n ) line endings rather than just \n .