Types of APIs: A Complete Guide to API Architectures
Blog post from Postman
Representational State Transfer (REST) is the most widely used API architecture for web services, utilizing standard HTTP methods to manage resources and is suited for public APIs requiring broad compatibility. Simple Object Access Protocol (SOAP) is a messaging protocol that uses XML and is favored in enterprise applications needing strict contracts and security. GraphQL, developed by Meta, allows clients to specify exact data needs, reducing over-fetching and under-fetching issues common in REST, and is optimal for mobile apps or applications with frequently changing requirements. Google Remote Procedure Call (gRPC) offers high performance by using binary protocol buffers over HTTP/2, ideal for internal microservices and real-time applications; however, it has limited browser support. WebSocket provides full-duplex communication over a single TCP connection, suitable for applications requiring real-time updates like chat or gaming. API types can also be categorized based on exposure, such as public, private, partner, and composite APIs, with each serving different purposes and audiences. Postman offers a unified platform for managing the entire API lifecycle, supporting design, testing, documentation, and collaboration across various API types, while the future of APIs points towards a blend of architectures like REST for public endpoints and gRPC for internal microservices, powered by advancements such as HTTP/3 and QUIC for enhanced speed and reliability.
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