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Assign a Random Port to Node.js Server

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💡 How do you conveniently assign an available port to an app?

👉🏼 Use PORT=0! The kernel will pick a random unused port number and bind it to your app. This is useful when you're deploying multiple apps on a single server.

Use server.listen(0) to let the OS assign a randomly available port to the Node.js server. Print the assigned port with server.address().port.
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