API Composition

Aggregate data from multiple services into one response.

query

Detailed Description

API composition is useful when a client needs data owned by multiple services.

Protect it with timeouts, partial responses, caching, and careful fan-out limits.

Client -> Composer
-> UserService
-> OrderService
-> PaymentService
<- combined response

Pros

Simple for clients, no shared database

Cons

Can create latency fan-out

Examples: GraphQL resolvers, BFF aggregators