REST vs GraphQL vs gRPC: Which API Protocol Should You Choose?

TL;DR Use REST for public APIs and simple CRUD operations. Use GraphQL when clients need flexible data fetching and you want to reduce over-fetching. Use gRPC for high-performance microservices communication. Modern PetstoreAPI implements all three protocols, letting you choose the right tool for each use case. Try Apidog today Introduction When building an API, you need to decide between REST, GraphQL, or gRPC. Each protocol excels in different scenarios: REST is universal and straightforward. GraphQL gives clients fine-grained control over data fetching. gRPC offers high performance for internal microservices. Most APIs stick to one protocol, but Modern PetstoreAPI implements REST, GraphQL, and gRPC, illustrating how the same API can be accessed via all three. 💡 If you’re building or testing APIs, Apidog supports REST, GraphQL, and gRPC. You can test all three protocols in one tool, compare responses, and ensure consistency across implementations. This guide covers when to use each p