How to drop into repl in node script

I've been reading through http://ift.tt/1aE6hDj , but unless I'm missing something, I'm not sure if you can start a script and when you hit a breakpoint drip into the repl. eg:

app.get('/', function(req, res) {

try {

  var bucket = [];
  var targets = require('url').parse(req.url);
  console.log('this is the outside ',url);
  //// break here and drop into repl ///
  emitter.getTarget = function(url) {
    var self = this;
    console.log('this is the ',url);