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Node.js error

ERR_SERVER_ALREADY_LISTEN

The server.listen() method was called while a net.Server was already listening. This applies to all instances of net.Server, including HTTP, HTTPS, and HTTP/2 Server instances.

Reference entryNode.jsFetched
This is a reference entry from Node.js documentation. A full explanation with fixes has not been written yet.

The error message

Node.js documentation lists the code ERR_SERVER_ALREADY_LISTEN without the printed message text.

Details

Category
Node.js error codes
Severity
error
Runtime
node

Related errors

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Source: Node.js documentation. Data fetched 2026-09-25T01:43:12.380Z.