markmarkoh/datamaps

★ 3,797JavaScriptAudience · developerComplexity · 2/5Setup · easy

Mindmap

mindmap
  root((Datamaps))
    What it does
      Interactive maps
      Choropleth coloring
      Bubble markers
    Tech stack
      D3.js
      TopoJSON
      SVG rendering
    Map types
      World map
      USA map
      Custom regions
    Features
      Hover tooltips
      Click events
      Arc drawing

mindmap root((Datamaps)) What it does Interactive maps Choropleth coloring Bubble markers Tech stack D3.js TopoJSON SVG rendering Map types World map USA map Custom regions Features Hover tooltips Click events Arc drawing

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Things people build with this

USE CASE 1

Add a world choropleth map to a dashboard that colors countries based on sales, user counts, or any numeric data.

USE CASE 2

Build an interactive USA state map showing election results or regional statistics with hover tooltips.

USE CASE 3

Display city or event locations on a world map as bubbles where each bubble's size represents a quantity.

USE CASE 4

Create a custom country map with internal regions by loading your own TopoJSON boundary file.

Tech stack

JavaScriptD3.jsTopoJSONSVG

Getting it running

Difficulty · easy Time to first run · 30min

Requires including D3 and TopoJSON as script tags before the Datamaps script, no npm required for basic use.

In plain English

Datamaps is a JavaScript library for adding interactive maps to web pages. It renders maps as SVG, which means they scale cleanly to any screen size without becoming blurry or pixelated. The library is bundled as a single script file, so adding a map to a page requires only including a couple of scripts and writing a few lines of JavaScript. The two most common uses are choropleth maps and bubble maps. A choropleth map colors regions differently based on data values, like showing election results by country or sales figures by state. A bubble map places circles of varying sizes at geographic locations to represent quantities, like showing city populations or event counts on a world map. Both types are interactive by default: hovering over a region shows a popup with data, and you can configure colors, tooltips, and click behavior. The library ships with three preset map files covering the world, the USA, or both together. You can also load custom map data in a format called TopoJSON, which makes it possible to display maps of individual countries with their internal regions. The README includes step-by-step instructions for creating country maps and example code for India, South Korea, and other countries. The setup process is straightforward for a developer: include D3 (a data visualization library), include TopoJSON, include the Datamaps file, add a div to your HTML, and call new Datamap() pointing at that div. Configuration options let you change colors, disable hover effects, add legends, draw arcs between locations, and extend behavior through a plugin system for custom visualizations. The project is available through npm and Bower (both are package managers for JavaScript). The README notes that the project is looking for a new maintainer, which suggests it may not be actively developed, though the existing code continues to function. The full README contains more examples than what was shown here.

Copy-paste prompts

Prompt 1

Using Datamaps, show me the minimal HTML and JavaScript to create a world choropleth map that colors each country based on a data object I supply, with a tooltip showing the country name and value on hover.

Prompt 2

I want to add a USA state map to my web page with Datamaps. Write the full HTML including the D3 and TopoJSON script tags, the Datamaps setup, and a data object that colors three states differently.

Prompt 3

How do I use Datamaps to place bubble markers on a world map where each bubble's radius is proportional to a population value I provide for each city?

Prompt 4

Show me how to load a custom TopoJSON file in Datamaps to display a map of India with its state boundaries instead of the default world map.

Prompt 5

I want to draw arcs between two cities on a Datamaps world map to show flight routes. What does the arc configuration object look like and how do I add it?

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