Edit: Fetch is available through the --experimental-fetch flag in Node. This is still very new :]

Edit: please note that this issue is pretty old and a lot of the information in the first few comments isn't up to date - for current status please see #19393 (comment) .

https://github.com/bitinn/node-fetch

It would make sense if window.fetch was implemented into core. it seems to be a stable enough API that would make a good candidate for inclusion. Not sure what the process is from here but thought I'd raise an issue :)