kewisch/ical.js

Health v2 · maintenance only

Adoption not part of the score

1176 stars · 155 forks observed · 2026-08-28

What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-30, confidence not recorded

A dependency-free JavaScript library for parsing and serializing iCalendar (RFC 5545), jCal, vCard (RFC 6350), and jCard data. Originally built as a libical replacement for the Mozilla Calendar Project, it works in both Node.js and browsers and includes recurrence iteration and timezone support.

Use cases

• parse .ics calendar files in javascript
• convert between ics and jcal formats
• parse vcard contact data in the browser
• calculate recurring event occurrences from RRULEs
• validate iCalendar data in a web app
• build a calendar feed reader in node
• handle timezones when parsing ics events

When to choose

• you need standards-compliant iCalendar or vCard parsing in JavaScript
• you want a zero-dependency library usable in both browser and Node.js
• you need recurrence rule expansion or timezone handling for calendar data

When to avoid

• you need to generate full-featured calendar server software with scheduling extensions beyond this library's scope
• you work in a non-JavaScript language where libical or native libraries are more appropriate

Facets

library · maturity stable

parser serialization parsers developer-tools web-development browser cross-platform icalendar vcard jcal jcard rfc5545 rfc6350 calendar contacts recurrence nodejs javascript

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