How does a GraphQL server turn a query into a response?

 How does a GraphQL server turn a query into a response?

In this post, I’m going to answer one simple question: How does a GraphQL server turn a query into a response?

Resolve Functions

Resolve functions are like little routers. They specify how the types and fields in the schema are connected to various backends, answering the questions “How do I get the data for Authors?” and “Which backend do I need to call with what arguments to get the data for Posts?”.

GraphQL resolve functions can contain arbitrary code, which means a GraphQL server can to talk to any kind of backend, even other GraphQL servers. For example, the Author type could be stored in a SQL database, while Posts are stored in MongoDB, or even handled by a microservice.

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