Getting Started

The code being made available to you is a stripped down version of Muxy’s Overlay extension on Twitch. This allows you to run it outside of Twitch proper, with all of the functionality you would expect to be present in the final shipped form.

You can use this to develop “apps” for inclusion into the Overlay extension, without the need to set up a full backend system and development environment. The rig comes as a NodeJS application which runs a local web server on your machine.

NOTE: Currently only Mac OS X and Linux development environments have been tested and are known to work. Running the rig on Windows may require extra work.


The rig runs as a NodeJS web server, and as such a globally accessible version of NodeJS must be available. The LTS version (currently 6.11) is used to test against. NodeJS may be downloaded here.

This documentation is bundled with the Overlay App Rig. The code can always be found on its GitHub page with specific tagged releases available.

The NodeJS libraries required to run the rig can be installed by running npm install on the command line.


To run the rig, simply run PORT=4000 npm run dev. This will start the server running on port 4000 on your local machine. You may change the port to suite your environment.

Once running, visit http://localhost:4000 to see the app rig. There are three tabs labeled “Viewer App,” “Broadcaster Config App” and “Broadcaster Live App.” Clicking these tabs will show the corresponding app you may build (only the viewer app is required) to have a complete Overlay App ready to deploy on Twitch.

Each app also has an “Open in New Window” button, which will open the corresponding app in its own window to ease debugging. The VueJS Chrome Extension is also helpful.


IMPORTANT: Before you begin to develop your app, you must obtain an app id from Muxy. This will give you access to the backend and Muxy provided-services, and uniquely identify your app in the Overlay. You can read more about this id and how to obtain one in the App Configuration section.

All files you need to edit to customize your app are located under the src/ directory. There you will find several directories, each of which contains a demoable app. You can create any folder here named after your app id and it will automatically be imported into the rig.

Each directory can have the following files or folders (using MuxyToastDemo as an example):

Path Required Purpose
assets/ No Any files you need to import into your app (images/fonts/etc.)
config.json Yes Configuration information about your application
ToastDemo.vue Yes The app viewers of a broadcast see and interact with
ToastDemoConfig.vue No The app a broadcaster will use to configure your application
ToastDemoLive.vue No The app a broadcaster will interact with while streaming

These items are described in more detail below.


Once you have your app in a good state, you can build a production version to test. Running npm run build in the project directory will create a production build in the dist/ folder for testing.

It will also run eslint on the code to ensure it follows our internal guidelines for code corectness. If you have a good reason to override any of our linter settings, you can do so with the eslint-disable commands.

Once you are satisfied with the results, simply zip up your app’s folder within the src/ directory and send that file to us. We’ll review your code and get back to you with next steps.

We will not accept any changes to code outside of your app’s directory withing the src/ folder, however bug fixes are always appreciated and can be incorporated by opening a Pull Request on the repo itself.