FRED toolkit in node.js - The beginning

app.js

var express = require('express');
var app = express();
require('./core.js')(app, {'namespace': 'api', 'api_key': 'abcdefghijklmnopqrstuvwxyz123456' });
app.listen(3000);

core.js

var express = require('express');

module.exports = function(parent, options) {
  var api_methods = require('./methods'),
      app = express(),
      api_endpoint = 'http://api.stlouisfed.org/fred/';

  function create_url() {
    var args = Array.prototype.slice.call(arguments, 0, arguments.length-1),
        id = Array.prototype.pop.call(arguments);
    return api_endpoint + args.join('/') + '?' + args[0] + '_id=' + id + '&api_key=' + (options['api_key'] || 'NO_API_KEY_GIVEN');
  };

  api_methods.forEach(function(data) {
    var query = '/' + data.parent + '/:' + data.parent;
    if (options['namespace']) query = '/' + options['namespace'] + query;
    app.get(query, function(req, res) {
      res.send('looking at ' + create_url(data.parent, req.params[data.parent]));
    });
    data.children.forEach(function(child) {
      var query = '/' + data.parent + '/' + child + '/:' + data.parent;
      if (options['namespace']) query = '/' + options['namespace'] + query;
      app.get(query, function(req, res) {
        res.send('looking at ' + create_url(data.parent, child, req.params[data.parent]));
      });
    });
  });

  parent.use(app);
};

methods.js

module.exports = [
  { 
    'parent': 'category',
    'children': [
      'children',
      'related',
      'series']
  },
  {
    'parent': 'releases',
    'children': [
      'dates']
  },
  {
    'parent': 'release',
    'children': [
      'dates',
      'series',
      'sources']
  },
  {
    'parent': 'series',
    'children': [
      'categories',
      'observations',
      'release',
      'search',
      'updates',
      'vintagedates']
  },
  {
    'parent': 'sources',
    'children': []
  },
  {
    'parent': 'source',
    'children': [
      'releases']
  }
];