Examples

World countries colored by land area using the opt-in areakm2 property. Log scale handles Russia-to-Monaco range. Demonstrates using areakm2 as a denominator for density calculations.

The mapjson.com homepage map — Equal Earth projection with dark ocean, graticule, hover tooltips, and zoom + pan. Uses properties=name to attach country names.

The minimal mapjson call — no parameters needed. Returns 110m world countries as geometry-only topojson. The fastest starting point for any world map.

Filtered to European countries at medium resolution with country names as properties. Hover to inspect each country.

All 539 Massachusetts ZIP code areas from the new postal layer, colored by 3-digit prefix. Every feature's gid is the bare ZIP code — join your ZIP-keyed data with a dictionary lookup.

US administrative regions using the regions layer filtered to a single country. AlbersUsa projection for clean continental rendering.

World countries including disputed and partially-recognized territories — Kosovo, Western Sahara, Palestine, and others — highlighted separately.

The Caribbean zoomed in at medium detail — each territory appears as its own polygon. Aruba, Martinique, Guadeloupe, Bonaire and others all hover correctly with their own ISO codes.

Poland's 16 first-level administrative divisions at high detail. Uses fitSize to auto-fit the projection to the returned geometry — the same pattern works for any country.

Countries colored by subregion — Northern, Eastern, Western, Middle, and Southern Africa. Capital cities plotted from capitalLat and capitalLng properties. Labels use a force simulation to avoid overlapping.

Aruba is 180 km² — invisible at standard resolutions. When filter is an ISO country code and detail=high, the API automatically serves a high-resolution file for small countries and territories.

A French Caribbean territory filtered by full country name — filter=Martinique is resolved to ISO code MQ server-side. At detail=high the 10m dataset resolves the island clearly.

14 counties fetched with filter=US-MA — only this state's districts, not all 3224 US counties. Population choropleth joined via 5-digit FIPS gid — the same code used by Census, BLS, and CDC data.

World countries on an orthographic (perspective) projection — the view from space. Land in sage green, ocean in slate blue, 30° graticule in white. Drag to rotate.

Continental US counties colored by depression prevalence from the CDC PLACES 2023 dataset — joined to county geometry by FIPS code via a client-side Socrata API call. State borders drawn with topojson.mesh.