#To list any process listening to the port 8080:
lsof -i:8080

#To kill any process listening to the port 8080:
kill $(lsof -t -i:8080)

#or more violently:
kill -9 $(lsof -t -i:8080)

sudo kill -9 `sudo lsof -t -i:9001`

npx kill-port 3000

netstat -ano | findstr :3001
taskkill /PID <yourid> /F

npx kill-port 8080

netstat -ano | findstr :<PORT>

(Replace <PORT> with the port number you want, but keep the colon)

Step 2:

Next, run the following command:

taskkill /PID <PID> /F