What is Leaflet used for?

Leaflet is a JavaScript library for adding interactive maps to a website: tile layers, markers, popups, and simple overlays, without needing an account with a mapping platform. First released in 2011, it stays around 42 KB gzipped and ships under the BSD-2-Clause license, factors that keep it common in projects from small blogs to production dashboards.

What does it look like in practice?

Common uses include store and branch locators, delivery and fleet tracking maps, real estate listing maps, choropleth maps for showing data by region, and simple travel or event maps embedded in a blog post. In each case, the pattern is similar: a base tile layer from a provider like OpenStreetMap or Mapbox, plus markers, popups, or shapes drawn on top from the site's own data. The official plugin directory lists several hundred community add-ons, which is how most Leaflet installs end up covering marker clustering, heatmaps, and drawing tools that aren't part of the core library.

Where does it fit best?

Leaflet fits teams without a dedicated GIS specialist who want to choose their own tile provider rather than commit to one platform's pricing. Because the core library only handles rendering, teams pick a free source like OpenStreetMap for basic use or a paid one like Mapbox for styled tiles, and can swap providers later without rewriting the mapping code.

Once a project needs turn-by-turn routing, 3D terrain, or smooth rendering of very large datasets, teams typically add a dedicated plugin or move to a WebGL-based library instead of extending Leaflet further.

Published at: August 6, 2026