Debugging React Native is really easy. But what if you want to debug React Native’s Packager?
node-inspector & node --debug-brk ./node_modules/react-native/packager/packager.js
It will give you an output like so
Debugger listening on port 5858 Node Inspector v0.11.1 Visit http://127.0.0.1:8080/?ws=127.0.0.1:8080&port=5858 to start debugging.
Once you visit the URL above (and hit play on the debugger), you will get full debugging support