A simple API function for calling an endpoint in Titanium, see demo.js for usage

api.js

/**
  Use this function to make calls to a JSON REST API see demo.js for useage
  @param options
  @param end (Callback)
**/

exports.api = function(options, end) {
  //This function makes calls to an Endpoint and then sends the data back via callback to the function that requested it.
  //Alloy.CFG.conn_url is set in your config.json file and can be accessed depending on which environment you are using.
  var method = options.method,
    conn_url = Alloy.CFG.conn_url,
    params = {},
    verb = options.verb,
    xhr = Ti.Network.createHTTPClient(),
    error_message;

  if (options.params){
    params = options.params;
  }

  xhr.onload = function(e) {
    var result;
    //JSON object is parsed and sent back ready to use
    result = JSON.parse(this.responseText);
    end(null, result);
  };

  xhr.onsendstream = function(e) {
    //You can listen to this event to then create a Titanium Progress Bar
    Ti.App.fireEvent('progress', {
      progress: e.progress
    });
  };

  xhr.onerror = function(e) {
    //Error handling
    var result;
    result = JSON.parse(this.responseText);
    error_message = new Error(result.error);
    end(error_message.message);
  };

  xhr.open(verb, conn_url + method;);

  xhr.send(params);
};

demo.js

var api = require('api');

function do_post(){

    var options = {
        verb: "POST",
        method: "/post/something",
        params:{
          param1:"stuff",
          param2:"more stuff"
        }
    };

    api.api(options, function (err, result){
        if (err){
          //Do error handling
        } else {
          //result is the parsed response from the server
        }
    });

}

function do_get(){

  var options = {
      verb: "GET",
      method: "/get/something"
  };

  api.api(options, function (err, result){
      if (err){
        //Do error handling
      } else {
        //result is the parsed response from the server
      }
  });

}