100 Best JavaScript & CSS Libraries Of 2021

As 2021 is about to pass, we went back through posts we’ve published this year to find the 100 most-read JavaScript and CSS projects. Have fun, happy New Year, and see you in 2022!

View Best 10 By Categories and Tags:

• Autocomplete
• Accordion
• Carousel
• Checkbox & Radio Button Replacement
• Countdown
• Custom Scrollbar
• Date & Time Picker
• Dialog & Popup
• Drag And Drop
• Form Validation
• Gallery
• Gallery Lightbox
• Grid Layout
• Image Zoom
• Lazy Load
• Loading Spinner/Indicator
• Mobile Menu
• One Page Scroll
• Parallax Effect
• Particles Animation
• Progressbar
• Range Slider
• Responsive Menu
• Smooth Scroll
• Switch
• Tabs
• Text Animation
• Timeline
• Toast Notification Libraries
• Tree View

Top 100 2021:

1. Multiselect Dropdown List With Checkboxes – multiselect.js(49802)
2. Confetti Falling Animation In Pure JavaScript – confetti.js(39113)
3. 17+ Responsive Accessible Header Navbar Templates(38634)
4. Multiple Select With Dropdown List – multiselect(29607)
5. Responsive Sidebar Navigation For Bootstrap 5(25937)
6. 10 Best Drag And Drop JavaScript Libraries (2021 Update)(24647)
7. Search Results(23290)
8. Elegant Multi-Select Component With Autocomplete – SelectPure(23282)
9. Medium.com Like Image Zoom Library – Lightense.js(21535)
10. Circular Progress Bar With Plain HTML / CSS(19860)
11. 10 Best Image Zoom JavaScript & CSS Libraries (2021 Update)(17853)
12. Create A Simple Event Calendar With JavaScript – Caleandar.js(15594)
13. Custom Single/Multi Select In Pure JavaScript – vanillaSelectBox(15206)
14. Animated Multi-step Form For Bootstrap(15117)
15. 10 Best JavaScript & CSS Carousel Libraries (2021 Update)(14247)
16. Flip Through Elements In A 3D Space – Carousel.js(14062)
17. Draggable & Touch-friendly Slider Carousel In Pure JS(13719)
18. Zoom Image On Hover – js-image-zoom(13518)
19. Realistic Book Page Flip Animation In JavaScript – StPageFlip(13163)
20. Create A Multi-Level Drop Down Menu with Pure CSS(13056)
21. 7 Best One Page Scroll JavaScript Libraries (2021 Update)(12951)
22. Simple Modal Window With Background Blur Effect(12447)
23. Add Instagram Photos To Your Website Without API – instagramFeed(11998)
24. Make HTML Table Sortable With sort-table Library(11768)
25. Minimal Cookie Consent Popup In JavaScript – PureCookie(11736)
26. Material Inspired Date & Time Picker – simplePicker(11616)
27. Render JSON Data As A Tree View – json-view(11150)
28. Simple 5-star Rating System with CSS and Html Radios(10823)
29. 10 Best Galleries In Pure JavaScript & CSS (2021 Update)(10498)
30. Create A Multi-Step Form In Bootstrap 5 – Enchanter(10164)
31. Animate Elements On Scroll With Parallax Effect – locomotive-scroll(10076)
32. 10 Best Toast Notification JavaScript Libraries (2021 Update)(9801)
33. Drag And Drop Flowchart Builder – Drawflow(9744)
34. Simple Table Paginator In Pure JavaScript – Paginator.js(9691)
35. Linear Step-by-Step Flow – Bootstrap Steps(9523)
36. 7 Best Countdown Timer JavaScript Libraries (2021 Update)(9438)
37. Full-featured Calendar JavaScript Library – tui.calendar(9260)
38. Minimal Date & Time Picker – dtsel(9083)
39. Infinite Multi-slide Carousel In Pure JavaScript – elder-carousel(9076)
40. 10 Best Custom Scrollbar JavaScript Libraries (2021 Update)(8919)
41.  Simple Celebrate Confetti Animation In JavaScript – Party.js(8437)
42. Basic 3D Carousel In Pure JavaScript(8328)
43. Beautiful Date Picker Component – MCDatepicker(8143)
44. Pretty Clean Tree Diagram In Pure CSS(7519)
45. Minimal Clean HTML5 Audio Player With Custom Controls – Green Audio Player(7406)
46. 7 Best Particles Animation JavaScript Libraries (2021 Update)(7363)
47. Privacy Policy(7197)
48. Fast Autocomplete/Typeahead Library For Bootstrap 5(7153)
49. Pure CSS Circular Percentage Bar(7062)
50. Customizable Gauge Library With JavaScript And Canvas – Gauge.js(7057)
51. Handle Long Press/Tap Event In JavaScript – long-press-event(6996)
52. 7 Best Pure JavaScript Form Validation Libraries (2021 Update)(6831)
53. Smooth Circle Progress Indicator In SVG And CSS(6823)
54. Simple Folder Tree With JSON And JavaScript – tree.js(6806)
55. Create Animated Gauges With JavaScript – SVG Gauge(6250)
56. Dark Mode Switcher For Bootstrap 4(6218)
57. Bootstrap Style Searchable Dropdown Plugin – fstdropdown(6153)
58. HTML & CSS Only FAQ Accordion(6140)
59. Multi-select Dropdown Component For JavaScript – slim-select(6140)
60. Responsive Lightbox Gallery With Pure JavaScript And CSS3 – lightGallery(6046)
61. Dynamic Tree View With Checkboxes – Treejs(6036)
62. Super Simple JavaScript Message Toaster – toast.js(6021)
63. Fancy Three-dots Loading Spinners With Pure CSS – Three Dots(5965)
64. Creating Fast and Responsive Gauges with Pure CSS(5899)
65. 10 Best Loading Spinner/Indicator JavaScript & CSS Libraries (2021 Update)(5850)
66. Flat Style JavaScript Date Picker – flatpickr(5831)
67. Off-canvas Navigation For Bootstrap 5(5821)
68. Vanilla JavaScript Date & Date Range Picker For The Web(5561)
69. Minimalist Falling Snow Effect with Pure JavaScript – Snow.js(5520)
70. Pure CSS Multi-level Navigation – menu.css(5511)
71. QR Code Generator With Logo And Title Support – EasyQRCodeJS(5486)
72. Minimal WYSIWYG Editor In Pure JavaScript – Suneditor(5218)
73. Customizable Event Calendar With Month/Year Selection – Color Calendar(5185)
74. Firework Animation With JavaScript And Canvas – fireworks-js(5094)
75. Number Countup Animation With Vanilla JavaScript – Animated Counter(5022)
76. Responsive Step Progress Indicator with Pure CSS(4998)
77. High Performance Select Box JavaScript Library – Virtual Select(4834)
78. 7 Best Custom Range Slider JavaScript Libraries (2021 Update)(4652)
79. Interactive Circle Cursor In JavaScript – Pointer.js(4625)
80. Lightweight JS Sorting Library with Native HTML5 Drag and Drop – SortableJS(4487)
81. Multi-level Dropdown Component For Bootstrap 5(4335)
82. Canvas Based HTML5 Gauge Library – Gauge.js(4334)
83. Elegant Box Shadows In Pure CSS – Shadow.css(4329)
84. 100 Best JavaScript & CSS Libraries Of 2020(4239)
85. 10 Best JavaScript & CSS Responsive Menus (2021 Update)(4205)
86. Animated Skeleton Loading Screens In Pure CSS(4148)
87. Fast Autocomplete Dropdown For Input Field – autocomplete.js(4076)
88. Classic Flip Clock Style Countdown & Counter Library – flip.js(4065)
89. Responsive Vertical Tabs For Bootstrap 4(4051)
90. Elegant Alert/Confirm/Toast Dialog Box In JavaScript – Cute Alert(3850)
91. Easy Tags Input Component For Bootstrap 5/4 – Tags.js(3832)
92. Minimal One Page Scrolling Effect with Pure JavaScript – onepagescroll.js(3825)
93. Draggable & Touch-friendly Carousel In Vanilla JavaScript – embla-carousel(3776)
94. Animated Snowfall Effect In Pure JavaScript(3674)
95. Developer-friendly Date Picker In Pure JavaScript – thedatepicker(3605)
96. 10 Best Parallax Scrolling Effects In JavaScript (2021 Update)(3596)
97. Scroll-triggered Counter Plugin – purecounterjs(3552)
98. Flipping Countdown Clock With JavaScript And CSS – countDown.js(3443)
99. Configurable Snow Falling Effects In JavaScript – snow.js(3424)
100. Read More / Read Less Functionality In Pure JavaScript – ReadMore.js(3413)