Node.js isn't a framework. It's a JS runtime, and for most purposes can be considered a variation of JavaScript. However, like Go, Node.js has such a rich networking support in its standard library, that some people go "frameworkless" when developing web apps in Node. But not as many as in Go, probably.

Something like Express would be more analogous to Phoenix in Elixir.

Node isn't really a framework, it's a runtime and is fairly close to a language. It's roughly analogous to Nashorn.

True, then in that scenario we should talk about comparing phoenix and express right?

edit: meant to say phoenix, not elixir.

Express and phoenix maybe. Elixir is not a framework. Node is to js perhaps as plug is to elixir. Even that kind of doesn't compare correctly though.

node is to js as beam is to elixir, roughly.

Node is not a framework though