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Actually, v8 powering a Firefox OS simulator IIUC.

... IIRC , there is a node-spidermonkey version,but Mozilla doesn't seem to be interested in working seriously on that project. Which is crazy because one would expect Mozilla to do exactly that.

I'd rather see the node-servo version ;)

As far as I understand, Servo will come with a WebKit embedding API, so the possibilities are pretty much endless.

Servo uses spidermonkey as JS engine, so I don't think it brings anything in a "run js headless" context.

Although it's possible that some of the changes required to integrate Spidermonkey and Servo might make the former easier to embed?

True, but mostly because writing a JS engine from scratch is hard although not impossible.

Sadly dead - https://github.com/zpao/spidernode

Last I heard, the node guys were quite adverse at maintaining both node-v8 and node-spidermonkey. I don't blame them ;)

And that doesn't help that the people who started node-spidermonkey left Mozilla and afaik can't contribute to open source projects that are not explicitly vetted by their current employer.

Yeah. There's an idea.