$ sudo npm install isomorphic-fetch
$ sudo npm install -g isomorphic-fetch

If want to update the isomorphic-fetch package execute the command as below,

$ sudo npm update isomorphic-fetch

Update package globally,

$ npm install -g isomorphic-fetch

Git clone:

$ sudo  git clone https://github.com/rektide/isomorphic-fetch.git

$ sudo  npm install -g ./isomorphic-fetch

isomorphic-fetch@2.2.1 /usr/lib/node_modules/isomorphic-fetch

How to remove isomorphic-fetch package :

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

$ sudo npm uninstall isomorphic-fetch

Basic Information of isomorphic-fetch NPM Package: