Yes, it's still Javascript but it's an entirely different library. That's like saying someone who knows jQuery knows Angular since they're both built on JS.
Also, a completely different context; back-end anything has a different set of concerns from the client side. While the language might be the same more or less as it were, the audience is completely different.
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u/thinkvitamin Mar 09 '15
"Because Node.js is Javascript at its core, the learning curve is non-existent if you already no a little bit of Javascript."