ubuntu 16.04 LTS : killing stubborn npm process (npm start "Port 3000 is already in use" | kill -9 PID)

mccrazy@mccrazy-Lenovo-N22:~$ cd Documents/mern2018/men_api/node-rest-auth/

baliw$ npm start

> node-rest-auth@0.0.0 start /home/mccrazy/Documents/mern2018/men_api/node-rest-auth

> node ./bin/www

GET / 304 1080.607 ms - -

GET /stylesheets/style.css 304 11.545 ms - -

^Z

[1]+  Stopped                 npm start

baliw$ npm start

> node-rest-auth@0.0.0 start /home/mccrazy/Documents/mern2018/men_api/node-rest-auth

> node ./bin/www

Port 3000 is already in use

npm ERR! Linux 4.15.0-34-generic

npm ERR! argv "/usr/bin/nodejs" "/usr/bin/npm" "start"

npm ERR! node v4.2.6

npm ERR! npm  v3.5.2

npm ERR! code ELIFECYCLE

npm ERR! node-rest-auth@0.0.0 start: `node ./bin/www`

npm ERR! Exit status 1

npm ERR! 

npm ERR! Failed at the node-rest-auth@0.0.0 start script 'node ./bin/www'.

npm ERR! Make sure you have the latest version of node.js and npm installed.

npm ERR! If you do, this is most likely a problem with the node-rest-auth package,

npm ERR! not with npm itself.

npm ERR! Tell the author that this fails on your system:

npm ERR!     node ./bin/www

npm ERR! You can get information on how to open an issue for this project with:

npm ERR!     npm bugs node-rest-auth

npm ERR! Or if that isn't available, you can get their info via:

npm ERR!     npm owner ls node-rest-auth

npm ERR! There is likely additional logging output above.

npm ERR! Please include the following file with any support request:

npm ERR!     /home/mccrazy/Documents/mern2018/men_api/node-rest-auth/npm-debug.log

baliw$ ps

  PID TTY          TIME CMD

 4863 pts/2    00:00:00 bash

 4956 pts/2    00:00:01 npm

 4965 pts/2    00:00:00 sh

 4966 pts/2    00:00:01 node

 5114 pts/2    00:00:00 ps

baliw$ kill 4956

baliw$ ps

  PID TTY          TIME CMD

 4863 pts/2    00:00:00 bash

 4956 pts/2    00:00:01 npm

 4965 pts/2    00:00:00 sh

 4966 pts/2    00:00:01 node

 5123 pts/2    00:00:00 ps

baliw$ kill -9 4956

[1]+  Killed                  npm start

baliw$ ps

  PID TTY          TIME CMD

 4863 pts/2    00:00:00 bash

 5131 pts/2    00:00:00 ps

baliw$ npm start

> node-rest-auth@0.0.0 start /home/mccrazy/Documents/mern2018/men_api/node-rest-auth

> node ./bin/www

^Z

[1]+  Stopped                 npm start

baliw$