Hello @kartik,
If it's just running (not a daemon) then just use Ctrl-C.
If it's daemonized then you could try:
$ ps aux | grep node
you   PID  1.5  0.2  44172  8260 pts/2    S    15:25   0:00 node app.js
$ kill -2 PID
Where PID is replaced by the number in the output of ps.
Hope it helps!!
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Thank You!!