Choosing an API style isn't a religious decision — it's an engineering one. Each paradigm excels in specific scenarios. Here's how to choose based on your actual needs, not Twitter discourse.
REST: The Reliable Workhorse
Best for: Public APIs, CRUD-heavy applications, teams that value simplicity.
REST is the most understood API style. It maps naturally to HTTP semantics, has excellent tooling, and every developer knows how to consume it. If your API is primarily CRUD operations with predictable data shapes, REST is probably the right choice.
Strengths: Caching (HTTP caching just works), simplicity, universal client support, great for webhooks.
Weaknesses: Over-fetching (getting more data than needed), under-fetching (needing multiple requests), versioning complexity.
GraphQL: The Flexible Query Language
Best for: Mobile apps, complex UIs with varied data needs, rapid frontend iteration.
GraphQL lets clients request exactly the data they need in a single request. When your frontend team is constantly asking for new REST endpoints or data shapes, GraphQL eliminates that friction.
Strengths: No over-fetching, strong typing, excellent developer experience with tools like Apollo and Relay, self-documenting schema.
Weaknesses: Complex caching, security (query complexity attacks), learning curve, potential N+1 problems on the server.
gRPC: The Performance Champion
Best for: Service-to-service communication, microservices, low-latency requirements.
gRPC uses Protocol Buffers for binary serialization — typically 5-10x faster than JSON. It's the standard for internal microservice communication at companies like Google, Netflix, and Square.
Strengths: Performance, bi-directional streaming, strong contracts via .proto files, code generation for 10+ languages.
Weaknesses: Not browser-friendly (needs gRPC-Web proxy), binary format harder to debug, less tooling for public APIs.
Our Recommendation
Most projects benefit from combining styles:
- REST for public-facing APIs and simple CRUD
- GraphQL for complex frontend data requirements
- gRPC for internal service-to-service calls
Designing a new API or rethinking your existing one? Let's architect it together.
