Should I install express, node, etc. every time I make a new project?

I have a few conceptual questions, as a newbie to AngularJS. I have been working on a project which connects Mongodb with Express and Node.js.

1. If I will be continuing to make projects which combine Mongodb with Express and Node.js, as well as other projects which use AngularJS to build a website, where should I store my installs of express, node.js, etc?

2. Is it the case there will be different dependencies for projects like this, because each project will require a number of different javascript libraries? (If so, I would think it's worth it to install javascript libraries each time I make a new project.)

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