Maven stores every version of every library you've ever needed in a central location. It doesn't pollute your working directory and it caches between projects.

Maven stores every version of every library you've ever needed in a central location. It doesn't pollute your working directory and it caches between projects. And this is more of a Java thing than a Maven, thing, but backwards compatibility between versions is way easier to manage. There's no incompatible binaries because you changed the node runtime between npm install and running your project.