How to fix Error: listen EADDRINUSE while using nodejs?

Question

If I run a server with the port 80, and I try to use xmlHTTPrequest i get this error: Error: listen EADDRINUSE

Why is it problem for nodejs, if I want t

Answer 1

Error reason: You are trying to use the busy port number

Two possible solutions for Windows/Mac

1. Free currently used port number
2. Select another port number for your current program

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1. Free Port Number

Windows

1. netstat -ano | findstr :4200
2. taskkill /PID 5824 /F

Mac

You can try netstat

netstat -vanp tcp | grep 3000

For OSX El Capitan and newer (or if your netstat doesn't support -p), use lsof

sudo lsof -i tcp:3000

if this does not resolve your problem, Mac users can refer to complete discussion about this issue Find (and kill) process locking port 3000 on Mac

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2. Change Port Number?

Windows

set PORT=5000

Mac

export PORT=5000