Singleton pattern in nodejs – is it needed?

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All of the above is overcomplicated. There is a school of thought which says design patterns are showing deficiencies of actual language.

Languages with prototype-based OOP (classless) do not need a singleton pattern at all. You simply create a single(ton) object on the fly and then use it.

As for modules in node, yes, by default they are cached, but it can be tweaked for example if you want hot-loading of module changes.

But yes, if you want to use shared object all over, putting it in a module exports is fine. Just do not complicate it with “singleton pattern”, no need for it in JavaScript.

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