Multiple Schema APIs
Multiple Schema APIs is a software architecture pattern where an application or service exposes multiple distinct API schemas, often tailored for different client types, use cases, or versions. This approach allows developers to provide specialized interfaces, such as GraphQL for flexible queries, REST for standard CRUD operations, and gRPC for high-performance communication, all from a single backend. It enhances flexibility, backward compatibility, and client-specific optimization by decoupling the internal data model from external API contracts.
Developers should use Multiple Schema APIs when building systems that need to serve diverse clients with varying requirements, such as web apps, mobile apps, and third-party integrations, to avoid a one-size-fits-all API that may be inefficient or complex. This pattern is particularly useful in microservices architectures, legacy system migrations, or when supporting both modern and legacy clients, as it allows for incremental updates and reduces client-side complexity. It helps maintain scalability and developer experience by providing the right tool for each job without overloading a single API.