"Port 4200 is already in use". Killing all the processes associated with 4200 did not work.

Question

I'm trying to get angular running on my Mac OS X 10.11.3 El Capitan.

I installed nodeJS and npm. Through npm I installed angular-cli.

I created a new app via the command sudo ng new first-app

I navigated into the app folder and ran sudo ng serve.

It threw the following error :

Could not start watchman; falling back to NodeWatcher for file system events.
Visit http://ember-cli.com/user-guide/#watchman for more info.
Port 4200 is already in use.

With reference from another answer, I tried the following :

sudo kill $(sudo lsof -t -i:4200)

It did not help.

Actually, I have re-installed nodejs, npm, angular-cli. When I had installed it before there was some build error as there was some bower issue. Not sure what. When I accessed localhost:4200 that time, the page showed up but with the error log on it. Now the page doesn't even load. The loading symbol just keeps circling near the favicon. I don't know if this could be a lead.

Thanks. I need to get angular running pronto. Lots to learn !

Answer 1

This help me. Kill the process on port 4200 on mac terminal

npx kill-port 4200

Then use

ng serve

Reference - Find (and kill) process locking port 3000 on Mac

Answer 2

Please fire this one on git cmd

sudo lsof -t -i tcp:4200 | xargs kill -9

Answer 3

Sometimes you need to kill process forcefully, use -9 for that

kill -9 $(lsof -t -i:4200)