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Designing Response Types

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Kyle O'Brien
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Let's say we have a basic GraphQL API that defines the following Query type:

type Query {
  users: [User!]!
}
This Query.users field makes intuitive sense: if you query it, you get back a list of User objects. However, this return type doesn't provide any insight into the result:
  • If the list is empty, is that because there are zero users, or did an error occur?
  • Even if the list is populated, did the API return all users or just a subset?

To answer questions like these, it's helpful for top-level fields of Query and Mutation to return "wrapper" objects that can include both the operation result and metadata about the operation's execution.

Learn more on the dev docs.

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