$ sudo npm install topojson
$ sudo npm install -g topojson

If want to update the topojson package execute the command as below,

$ sudo npm update topojson

Update package globally,

$ npm install -g topojson

Git clone:

$ sudo  git clone https://github.com/rektide/topojson.git

$ sudo  npm install -g ./topojson

topojson@3.0.2 /usr/lib/node_modules/topojson

How to remove topojson package :

You can uninstall or remove this package from your node_modules run the command as below,

$ sudo npm uninstall topojson

Basic Information of topojson NPM Package: