So how does Node run, from an IBMi perspective? Is it like Tomcat, where
you run a QSH command in batch? Does Node always run the same way?

I interpreted your question as whether you start Node via QSH or presumably
some other Unix shell. Yes, you use a Unix shell to start Node. It runs in
PASE - like Tomcat (which is Java based, which also runs in PASE).

It appears that Aaron interpreted your question to be in regards to the
similarities between the Tomcat HTTP server and the HTTP service
implemented in Node.

In that regard, Tomcat IS AN HTTP SERVER which includes a module which
implements a subset of the Java EE specification.

In contrast, Node is a JavaScript language runtime which includes an HTTP
module, which enables applications to implement the HTTP protocol (both
server and client) if you want to.

Note the distinction? Tomcat IS AN HTTP SERVER - meaning that the HTTP
service is Tomcat's primary function (the Java EE subset is arguably a
secondary function).

The primary function of Node is its JavaScript language runtime, which may
be used to implement an HTTP service.

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