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Really? I thought V8 makes JavaScript run on a server.

no, V8 makes javascript run, iojs makes javascript run on server.

So it's useless without V8. I mean I can install Chrome or an Awesomium app onto server and it will also run JavaScript on server (via V8).

And why would you want to do that?

V8 is just a JS engine, it is used in io.js, node.js, chrome, and chromium.