Picking up the random port and current interface for a node.js server is pretty easy!
Fetching the address from the interface:
Just loop through the interfaces of the OS and get the IPv4 from them.
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Fetching a random port:
There are few node modules out there for getting random free ports, but there is a easier way:
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The trick is all about
server.listen(0,IPv4) this will cause the server to listen on a random port unless in a cluster where each worker will receive the same “random” port each time they do a
listen(0) i.e the port is random for the first time and there after it’s predictable.
Well, there might be more better ways of doing this, but this was a quick hack I need to make for something I was working on.