Skip to content

Assign a Random Port to Node.js Server

View on Twitter

💡 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.

You might also like

Make Your Site Portable By Using Permalinks Read tip

AWS Serverless Cost Calculator Read tip

What Does This Bash Command Do? Read tip