Run JSMeter on your code, getting a reasonable output to start cleaning up code complexities

jsmeter.js

#!/usr/bin/env node

// npm install -g jsmeter

(function () {
  var verbose = false;

  var args = process.argv;
  var fs = require("fs");

  var parse = require('jsmeter/parse').make_parse();
  var tokens = require('jsmeter/tokens').setup()
  var complexity = require('jsmeter/complexity').make_complexity();

  for (var a = 2; a < args.length; a++) {
    // for debugging
    if (args[a] === "--verbose") {
      verbose = true;
      continue;
    }

    // if your code throws syntax errors but it's actually ok, ask to be forgiven
    if (args[a] === "--forgive") {
      Object.prototype.error = function (message, t) {
          t = t || this;
          t.name = "SyntaxError";
          t.message = message;
      };

      continue;
    }

    fs.readFile(args[a], "utf8", (function (name) {
      return function (err, data) {
        if (err) throw err;

        var tree = parse(data);

        complexity.complexity(tree, name);

        var result = complexity.getFunctions();
        result = result.sort(function(a, b) {
          if (a.halsteadLevelF() < b.halsteadLevelF()) {
            return -1;
          } else {
            return 1;
          }
        });

        for (var i = 0; i < result.length; i++) {
          if (!result[i].shortName.match(/Anonymous/)) {
            if (verbose) {
              console.dir(result[i]);
            }
            var output = result[i].linesF() + '\t' + (1 - result[i].halsteadLevelF()) + '\t' + result[i].shortName.replace(/^\[\[[^\]]*\]\]\.?/, "") ;
            console.log(output);
          }
        }
      };
    })(args[a]));
  }
})();