node debugger issue: debugger not working when exporting

Question

this is one program written for nodeschool/stream-adventure/duplexer-redux. of course this is not gonna fulfill the requirement. But what I want to do is simply put a debugger there and watch what happens--just like set import ipdb; ipdb.set_trace in python. so what is the right way of doing this?

   1 var duplexer = require('duplexer');
   2 var through = require('through');
   3 
   4 module.exports = function (counter) {
   5     debugger;
   6     var dic = {};
   7     var tr = through(function (buf) {
   8                 if (dic[buf.country]) {
   9                     dic[buf.country] = 1;
  10                 } else {
  11                     dic[buf.country] = dic[buf.country] + 1;
  12                 }
  13             });
  14     counter.pipe(tr);
  15 
  16     return tr;
  17 }

18

Answer 1

1.Start Node with debug argument:

$ node debug yourscrupt.js

2.Run the debugger commands as you need.

If you want to debug in the browser, node-inspector is a good choice.