Node.js V8 Inspector

node inspect webhello.js

Enter help to view a list of commands.

cont or c: continue execution
next or n: run the next command
step or s: step into a function being called
out or o: step out of a function and return to the calling command
pause: pause running code
watching variable values with watch('myvar')
setting breakpoints with the setBreakpoint() / sb() command (although it’s easier to insert a debugger; statement in your code)
restart a script
.exit the debugger (the initial . is required)