Drupal 8 has plenty of contributed modules to help you building a headless/decoupled web application. However, getting all those set up correctly could be a daunting task. 

Understanding this is an issue that should be addressed and as mentioned previously in our blog posts of this “Improving Drupal and Gatsby Integration” series we wrote and contributed two modules Toast UI Editor and Build Hooks. But there are some other needed modules: JSON-API, JSON-API Extras, Site Settings to mention a few and also a minimum configuration you should take care of to have a pleasant experience with your Drupal-Gatsby integration.