graphql-architect

To prevent N+1 queries in GraphQL, implement DataLoader batching patterns within resolvers to group and cache multiple database requests into a single fetch. This resolver optimization ensures efficient query planning and eliminates redundant data loading across related schema fields.

Designing federated GraphQL schemas involves creating schema-first SDL definitions with clear ownership boundaries for subgraphs and applying Apollo Federation directives like @key. This architecture separates concerns while allowing a gateway to compose multiple subgraphs into a unified API.

Migrating REST services to Apollo Federation requires defining federated schemas with clear boundaries, implementing DataLoader batching for relations, and configuring a gateway that enforces query depth and complexity limits to ensure performant and safe query plans.

Setting up GraphQL subscriptions requires configuring pub/sub architecture within your schema design to push real-time updates to clients. This involves defining subscription types in the SDL and ensuring safe subscription scaling alongside query complexity and depth limiting controls.

To enforce security in a GraphQL gateway, apply query complexity and depth limiting controls alongside authentication and authorization patterns. These constraints prevent malicious or overly expensive queries from degrading API performance and are essential for scalable schema design.