Optimizing geographic data files with TopoJSON

The topojson is a command-line utility used to create files in the TopoJSON-serialized format. The TopoJSON format will be discussed in detail in Chapter 6, Finding and Working with Geographic Data. The topojson utility is also installed via npm.

We already have installed Node.JS and npm, so enter the following on the command line:

npm install -g topojson

Once the installation is complete, you should check the version of topojson installed on your machine just as we did with Node.js:

topojson –version

If you see Version 1.x, it means you have successfully installed topojson.