debugging

start a process in inspect mode and connect to it use breakpoints

node --inspect app.js
# can be useful if debugger statement is already in code

# inspect with active breakpoint - preferred,-app not fully initialized, no async task
node --inspect-brk app.js

then chrome://inspect from browser (Chrome DevTools) goto remote target click on inspect link

also, putting “debugger;” statement into code creates breakpoint in code

see Debuggin Guide from nodejs.org