CouchDB is a document store style database. GraphQL is more focused on the API layer (how do I query any underlying data sources for exactly the data I need) in

CouchDB is a document store style database. GraphQL is more focused on the API layer (how do I query any underlying data sources for exactly the data I need) instead of tying you into one particular database. So, in theory, some of your GraphQL objects might live in CouchDB but others might live in PostgreSQL or a file store.