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Node.js could not bind because the address is already in use

EADDRINUSE: address already in use

Node.js could not start a server because another process is already listening on the same host and port combination.

EADDRINUSEnetwork

Observed message

EADDRINUSE: address already in use

Why it happens

  • Another process is already listening on the target port.
  • A previous dev or server process did not shut down cleanly.
  • Multiple app instances are trying to bind the same address.

How to fix it

  1. Stop the conflicting process that is already using the port.
  2. Change the configured port if the collision is expected in the environment.
  3. Make sure restarts and local dev scripts shut down old listeners cleanly before starting again.

Official reference

Node.js Errors

Related errors

ECONNREFUSEDNode.js connection was refused by the target serviceECONNRESETNode.js connection was reset by the peerETIMEDOUTNode.js operation timed out before completionENOENTNode.js could not find the requested file or directory

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Node.js EADDRINUSE address already in use: causes and fixes | Error Atlas