The module requires installation via composerin order to pull in the dependencies for the module to work, most notably the webonyx/graphql-php library.
Install the module by running composer require drupal/graphql:^4.
Enable the GraphQL module in extensions.
Login and navigate to /admin/config/graphql to create a new server.
At this point you can either start with the "Example schema" provided by the graphql_examples module (see the Introduction section) or start right away making your own custom schema as we will describe in the following sections.
At this point you can check the permissions added by the module in the permissions page at /admin/people/permissions. You can control who can perform arbitrary and persisted queries against graphql and also who can access the Voyager or the GraphiQL pages.
Creating a schema
Like mentioned in the Introduction the 4.x version of the module uses a schema first approach which requires you to first start by making a schema and then start implementing how to resolve each of the fields of your schema. In the next chapter we will look at how to create your own schema to start resolving fields and returning actual Data from Drupal using the module.