title: Using GraphQL inside REST API for data querying
body: <p>I have an existing Node.js REST API that currently uses pg-promise for querying data from database. But instead I want to use GraphQL for querying the data from database. So, I want to use GraphQL only internally. All tutorials I found show how to build a GraphQL server. But can I use GraphQL only internally for querying data as well?</p>
  <p>Thanks!</p>