Detecting Port Conflicts

When a dev server fails to start because a port is already in use, diagnose and resolve it.

Detection

Scan terminal output for these patterns:

• EADDRINUSE
• address already in use
• Port XXXX is already in use
• bind: address already in use
• OSError: [Errno 98] Address already in use

Extract the port number from the error message.

Diagnosis

Find what's using the port: