how to stop a npm server code example

Example 1: stop npm server cmd

ps aux | grep node 
#The last record is for grep and it is not victime 
#You should kill the processes who are running ".../react-scripts start"

sudo kill -9 process_id

Example 2: npm stop react app

taskkill -F -IM node.exe

Example 3: stop npm server

npm run react-scripts start