Answers for "Port 4000 is already in use"

Something is already running on port 3000.

npx kill-port 3000 8080 4200

Posted by: Guest on July-02-2021

Error: That port is already in use.

# list the running ports
$ netstat -ltnp
# kill specific port in my case for django 8000. kill using PID
$ kill -9 31434

Posted by: Guest on July-17-2021

npm port already in use

$ lsof -i tcp:3000
$ kill -9 PID

Posted by: Guest on September-23-2020

Port 3000 is already in use, but when I try to kill nothing is found

netstat -ano | findstr :3000
taskkill /PID "123" /F

Posted by: Guest on May-24-2020

Port 3000 is already in use.

If this error is in nextjs

in package.json, update scripts:
"dev": "PORT=3001 next dev",

you can choose other port, and also change for start.

Posted by: Guest on July-27-2021

Code answers related to "Port 4000 is already in use"