Node.js gives us the module system. But we still need a way to publish and use modules built by other people. The npm package system is a server and command line tool. The server hosts almost 200,000 packages written by people around the world. The command line tool lets us use these packages and even publish our own. In this video we'll install the express web framework package. You'll see where the package is installed and how we can use it in our main program.
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