node.js live debugging

• start node.js app with inspect setting
• pm2:  pm2 xxx.js --node-args="--inspect=IP:PORT"
• attach debugger 
• CUI
• node inspect IP:PORT
• GUI
• VSCode
• https://code.visualstudio.com/docs/nodejs/nodejs-debugging#_remote-debugging
• https://nodejs.org/docs/latest-v8.x/api/debugger.html