9 Best JavaScript Calendar Components To Manage/View Events (2026 Update)

When you’re building a modern web application, you might need a calendar component to manage events, tasks, and appointments for your business.

In this post, you will find a list of the 9 best JavaScript libraries to generate responsive and nice-looking calendar components in a simple way. Have fun with it and don’t forget to share it with your friends.

Originally Published May 12 2020, updated Dec 08, 2025

1. Feature-rich And Draggable Event Calendar Plugin – FullCalendar

FullCalendar is a lightweight yet powerful and developer-friendly JavaScript library to create flexible, draggable event calendars on the modern web app.

Features:

Multiple languages.
Lots of themes to fit your needs.
Supports custom timezone.
Custom toolbar.
Supports Month, TimeGri, List, DayGrid, Timeline, and Custom Views.
Custom header & footer controls.
Uses virtual DOM for faster rendering (V5).
Compatible with Bootstrap 5

[Demo] [Download]

2. Simple Multilingual Calendar Component With Vanilla JavaScript

A tiny clean calendar in Vanilla JavaScript. Create a beautiful customizable calendar for your website, using the ISO 8601 standard. No dependencies, no jQuery, and no frameworks.

Key features include simple localization, CSS/HTML customization, multiple calendar instances on a single page, automatic theme switching (light and dark), customizable week starts and weekends, week number display, accessibility features (ARIA labels, tabindex, keyboard navigation), and date/time range selection with limits and custom popups.

[Demo] [Download]

3. Full-featured Calendar JavaScript Library – tui.calendar

tui.calendar is a powerful, full-featured calendar library used to showcase custom events, schedules, tasks in daily, weekly, and monthly views.

Demo Download

4. Bootstrap 5 Calendar Component With Dark Mode

An easy and animated calendar UI component with dark mode. Built with the Bootstrap 5 framework.

Demo Download

5. Customizable And Extensible Calendar Heatmap Library – cal-heatmap

A versatile JavaScript charting library that allows you to create customizable, extensible, and interactive time-series calendar heatmaps similar to Github’s contribution graph.

Features:

Supports various data types such as JSON, CSV, TSV, and plain text (TXT).
Dark Mode and Light Mode.
Allows to customize the calendar language, timezone, and locale-specific settings.
Allows to set min/max/start dates.
Useful legend and tooltip plugins.
Lots of API methods and events.
Written in Typescript and ES6, and fully tested on real browsers
And much more.

Demo Download

6. Feature-rich Event Calendar In JavaScript – Calendar.js

A powerful, responsive, dynamic, mobile-friendly calendar & scheduling tool for your business.

Features:

Supports various data types such as JSON, CSV, TSV, and plain text (TXT).
Dark Mode and Light Mode.
Allows to customize the calendar language, timezone, and locale-specific settings.
Allows to set min/max/start dates.
Useful legend and tooltip plugins.
Lots of API methods and events.
Written in Typescript and ES6, and fully tested on real browsers
And much more.

[Demo] [Download]

7. Lightweight Yearly Booking Calendar In JavaScript – Booking Calendars

Booking Calendars is a tiny JavaScript library for displaying reservation calendars on your site or web app. Useful for businesses that rely on online reservations, such as hotels, restaurants, or event venues.

The JavaScript library generates a full-year calendar to display booked dates or reservation availability on the page. This allows your customers to easily identify availability and make informed decisions.