For Haxe client

In order to call a RESTful JSON API from a Haxe application, you need the following steps:

  1. Create a Sbt project, which contains the MIDL definition of the RESTful JSON API that you will call in your JavaScript application. The project is also known as the API's SDK.
  2. Publish the package of SDK to Haxelib or install it locally.
  3. Add the dependency to the SDK into your client application build configuration.
  4. In your client application, initilize the service defined in SDK and invoke methods of the service.

In this article, we will create a command-line program that queries the public organization memberships for a specified Github user. It will call Github API via a Microbuilder SDK, which is also created in this article.


Microbuilder requires Haxe for code generation, and Sbt to manage build pipeline.

You need download and install Haxe 3.2.1 and Sbt 0.13.9, then setup Haxelib with the folloiwing commands:

haxelib setup ~/.haxelib.d
haxelib install hxjava
haxelib install dox

Create the SDK

Sbt configuration for SDK

Prepare an empty directory for the SDK project. Then, create project/plugins.sbt and add sbt-microbuilder dependency into it.

// project/plugins.sbt
addSbtPlugin("com.thoughtworks.microbuilder" % "sbt-microbuilder" % "4.0.6")

There are multiple plugins in the sbt-microbuilder library. MicrobuilderCommon plugin provides the settings for a Haxe SDK library. The MicrobuilderCommon will be automatically enabled once you enable other plugins in sbt-microbuilder.

So you edit build.sbt, and add enablePlugins(MicrobuilderJsSdk) or enablePlugins(MicrobuilderJavaSdk) :

// build.sbt

organization := "com.thoughtworks.microbuilder.tutorial"

name := "github-sdk"

MIDL API definition

By default, your MIDL is under src/haxe directory, and the package name of your MIDL is caculated from organization and name settings in your build.sbt.

The interface of MIDL API should be put under com.thoughtworks.microbuilder.tutorial.githubSdk.rpc package, or src/haxe/com/thoughtworks/microbuilder/tutorial/githubSdk/rpc directory. You can run sbt jsonStreamServiceModules::packageName in shell to check that.

Now you define List user organizations endpoint in a MIDL interface.

// src/haxe/com/thoughtworks/microbuilder/tutorial/githubSdk/rpc/IOrganizationService.hx
package com.thoughtworks.microbuilder.tutorial.githubSdk.rpc;

import jsonStream.rpc.Future;
import haxe.ds.Vector;
import com.thoughtworks.microbuilder.tutorial.githubSdk.model.OrganizationSummary;

interface IOrganizationService {

  @:requestHeader("User-Agent", "organization-list-cli")
  @:route("GET", "users/{username}/orgs")
  function listUserOrganizations(username:String):Future<Vector<OrganizationSummary>>;

  // TODO: Other endpoints described at


MIDL JSON schema definition

The MIDL reference to a MIDL JSON schema OrganizationSummary, which should be defined under com.thoughtworks.microbuilder.tutorial.githubSdk.model package, or src/haxe/com/thoughtworks/microbuilder/tutorial/githubSdk/model directory. You can run sbt jsonStreamModelModules::packageName in shell to check that.

// src/haxe/com/thoughtworks/microbuilder/tutorial/githubSdk/model/OrganizationSummary.hx
package com.thoughtworks.microbuilder.tutorial.githubSdk.model;

class OrganizationSummary {

  public function new() {}

  public var login:String;

  public var id:Int;

  public var url:String;

  public var avatar_url:String;

  public var description:String;


Now you can execute the following command to compile and package the SDK to a NPM package.

sbt haxelibInstallDependencies haxe-js:packageNpm

Publish the SDK to Haxelib

Before you publish the SDK to Haxelib, you must register a user name for haxelib. Run the following command for the registration

haxelib register

Then, add some necessary settings in build.sbt, including:

  • haxelibReleaseNote
  • haxelibContributors
  • haxelibDependencies
  • licenses
  • haxelibDependencies
  • haxelibSubmitUsername

See this repository for the complete code base.

Then, run the following command in your shell.

sbt haxe:publish

Setup a command-line program

Now, create your client-side application.

First, install github-sdk by executing the following command in shell:

haxelib install github-sdk

Then you will need to install hxssl, because the Github API is HTTPS protocol.

haxelib git hxssl

Now, create a build.hxml and add the dependency to github-sdk.

# Library dependencies
-lib github-sdk
-lib hxssl:git

# Execute the `Main` class
-x Main

This build.hxml contains flags for Haxe compiler. When you run haxe build.hxml, the Haxe compiler will run Main.hx as entry point of this program, with library dependencies github-sdk and hxssl.

The source file of the command-line program

Now you will create the source code for the command-lib program. Create Main.hx, and edit it:

import com.thoughtworks.microbuilder.tutorial.githubSdk.model.*;
import com.thoughtworks.microbuilder.tutorial.githubSdk.proxy.*;
import com.thoughtworks.microbuilder.core.*;

class Main {

    public static function main() {
        // Initialize organization service in Github SDK
        var organizationService = {
            var urlPrefix = "";
            var routeConfiguration = MicrobuilderRouteConfigurationFactory.routeConfiguration_com_thoughtworks_microbuilder_tutorial_githubSdk_rpc_IOrganizationService();
            var outgoingJsonService = new MicrobuilderOutgoingJsonService(urlPrefix, routeConfiguration);

        // Read GITHUB_USERNAME environment variables
        var username = Sys.environment()["GITHUB_USERNAME"];

        // Send a request to Github API via organization service
            function(response):Void {
                trace('$username belong to ${response.length} organizations: ${ [ for (organization in response) "\n * " + organization.login ].join("") }');
            function(error):Void {
                trace('Error: $error');


organizationService.listUserOrganizations returns a Future1, which pass the response data to the first function you passed to start method.

The example is complete now.

You can run it in shell and see its output:

$ haxe build.hxml
Main.hx:22: Atry belong to 3 organizations:
 * ThoughtWorksInc
 * ThoughtWorks-Xi-an-Scala-Camp
 * thoughtworkschina

You can find the entire example of command-line program at organization-list-cli.