# Leaflet/Leaflet.markercluster

Marker Clustering plugin for Leaflet

Repository: https://github.com/Leaflet/Leaflet.markercluster
Canonical: https://ross.abutalabs.com/products/leafletmarkercluster
Language: JavaScript
License: MIT
License Family: permissive
Topics: leaflet, map, mapping, clustering, leaflet-plugins
Last push: 2024-08-12T22:53:52+00:00

## Health v2 (maintenance only)
Score: 32/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 0, release rhythm 35, longevity 100
- inputs: {"age_days": 5167, "days_push": 751, "days_rel": null, "gap_med": null, "n_releases_24m": 0}
- flags: no_releases
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 4162, forks 999 (observed 2026-08-28T04:08:37.761509+00:00)

## What it is
A Leaflet plugin that provides animated marker clustering for interactive maps, grouping large numbers of markers into clusters for performance and readability. It supports bulk marker operations, customizable cluster icons, spiderfy layouts, and cluster events.

## Use cases
- display thousands of map markers without performance issues
- cluster map markers with zoom animations
- customize cluster icon appearance on a Leaflet map
- spiderfy overlapping markers on click
- bulk add and remove markers on a map efficiently

## When to choose
- you use Leaflet and need to render many markers performantly
- you want animated, customizable marker clustering out of the box
- you need spiderfying and cluster event handling

## When to avoid
- you use a mapping library other than Leaflet
- you only have a handful of markers and don't need clustering
- you need a maintained plugin with frequent updates

## Facets
- artifact type: plugin
- maturity: maintenance
- function: ui-components, data-visualization
- domain: web-development, frontend
- platform: browser
- tags: leaflet, marker-clustering, gis, maps, leaflet-plugins, javascript

## Member repositories
- Leaflet/Leaflet.markercluster (main) score 32

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:08:37.761509+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-29T18:22:48.449569+00:00, confidence not recorded.
  - readme: https://github.com/Leaflet/Leaflet.markercluster (fetched 2026-08-28T04:08:37.761509+00:00, sha c4a1b8837df4)
  - registry_npm: https://registry.npmjs.org/leaflet.markercluster (fetched 2026-08-29T09:13:49.399971+00:00, sha bba1603fd637)
- Data as of 2026-08-30T08:39:29.467469+00:00.