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1. Set up a Drupal 8 Website

2. Enable the DrupalGap 8 Module

3. Install the DrupalGap SDK

Go to your Drupal root folder and run the DrupalGap install script, or you can manually install the SDK.

cd drupal
./modules/contrib/drupalgap/scripts/install app https://www.example.com

This will create a folder called app, place the DrupalGap SDK inside of it, create a settings.js file for the app and then set the sitePath variable to https://www.example.com.

Done

This sets up an empty web app. You can easily add other types of apps later, all with only one set of code.

Demo it in a browser by visiting:

https://www.example.com/app