10 Principles for Designing Good GraphQL Schemas

Jens Neuse, CEO and co-founder of WunderGraph, discusses the intricacies of designing effective GraphQL schemas, emphasizing the importance of a capability-based, client-centric approach. Unlike REST APIs, GraphQL mandates a schema, ensuring that data queries are explicit and introspectable, which facilitates tools like GraphiQL and GraphQL Playground. Neuse outlines ten principles for optimal schema design, focusing on client needs, clear error handling, and practical nullability. He advises against deriving schemas from underlying data models to avoid leaky abstractions and stresses the permanence of published fields due to potential client dependencies. Pagination is highlighted as vital for both performance and security, and the schema should align with organizational structures, following Conway's Law to decide between monolithic and federated designs. The article introduces WunderGraph Hub, a collaborative platform for API development, urging teams to iterate based on feedback to refine their schemas continuously.