Something is already running on port 3000 ! why

But nothing is already running on port 3000!!!

if “127.0.0.1 localhost” is not in your host. when you run yarn start . it tell you Something is already running on port 3000 ....

see detect-port#L58

the error msg should more friendly.

[piggy2303]

this work for me 1 open chrome 2 open : localhost:3000 3 write something on your code 4 refesh tab on chrome -> it will crash 5 npm start again 6 done 😃

[leonwatson2]

@benhanks040888 adding

127.0.0.1 localhost

in the hosts file

/etc/hosts for mac C:\Windows\System32\Drivers\etc\hosts for windows

helped. Thank you so much sir.