I've seen two different fetch here:
Can someone tell me the difference between the two?
PS: I've read the README.md but I still didn't get the difference. Last time I checked, Isomorphic means it has similar form or relation. It still doesn't make sense to me.
FETCH is polyfill for browsers which don't have fetch function (caniuse.com/#search=fetch). It will add fetch function to your browser window object.
While isomorphic-fetch is implementation of fetch for both node.js and browser, built on top of fetch polyfill.