What is clusterize.js?

nexts/clusterize.js — explained in plain English

Analysis updated 2026-06-24

★ 7,274JavaScriptAudience · developerComplexity · 2/5Setup · easy

Mindmap

mindmap
  root((clusterize.js))
    What it does
      Large list rendering
      Performance boost
      Scrollable tables
    Tech stack
      JavaScript
      No dependencies
    Use cases
      Big data display
      Infinite lists
    Audience
      Frontend developers

mindmap root((clusterize.js)) What it does Large list rendering Performance boost Scrollable tables Tech stack JavaScript No dependencies Use cases Big data display Infinite lists Audience Frontend developers

Click or tap to explore — scroll the page freely

What do people build with it?

USE CASE 1

Add smooth, fast scrolling to a list containing tens of thousands of items in your web app.

USE CASE 2

Display a large data table in the browser without freezing the page or causing lag.

USE CASE 3

Improve performance of any scrollable list view that renders too slowly with standard HTML.

What is it built with?

JavaScript

How does it compare?

	nexts/clusterize.js	stefanpenner/es6-promise	alasql/alasql
Stars	7,274	7,274	7,278
Language	JavaScript	JavaScript	JavaScript
Setup difficulty	easy	easy	easy
Complexity	2/5	1/5	2/5
Audience	developer	developer	developer

Figures from each repo's GitHub metadata at analysis time.

How do you get it running?

Difficulty · easy Time to first run · 5min

So what is it?

Clusterize.js is a small JavaScript plugin for displaying large sets of data in a scrollable list or table without slowing down the browser. It uses no external frameworks or libraries. The README is brief and directs readers to the project website for usage details and a live demo. The repository tags it as relevant to list views, performance, and scrolling. Installation is available through npm. Beyond that summary, the README does not describe how the plugin works, what options it accepts, or what browsers it supports. The project website at clusterize.js.org is the intended place for documentation.

Copy-paste prompts

Prompt 1

I'm using clusterize.js to render 50,000 rows in a scrollable div. Show me the minimal setup code to initialize it with an array of HTML row strings.

Prompt 2

How do I dynamically update the data in a clusterize.js instance when new items are fetched from an API without reinitializing the whole plugin?

Prompt 3

My clusterize.js list is inside a modal that starts hidden. What do I need to do so it initializes correctly once the modal becomes visible?

Frequently asked questions