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Architecture Matrix
gRPC vs REST: Microservices API Protocol Comparison
Compare high-performance binary RPC communication (gRPC) against universal resource-based web APIs (RESTful JSON).
Feature & Performance Breakdown
| Feature / Metric | gRPC (HTTP/2 + Protobuf) | REST (HTTP/1.1 + JSON) | Advantage |
|---|---|---|---|
| Payload Size & Performance | Compact binary Protocol Buffers (up to 7x faster) | Verbose text-based JSON serialization | gRPC (HTTP/2 + Protobuf) |
| Multiplexing & Streaming | Bidirectional streaming via native HTTP/2 | Request/Response only (requires SSE or WebSocket) | gRPC (HTTP/2 + Protobuf) |
| Browser Support | Limited (requires gRPC-Web proxy) | Universal native fetch/XMLHttpRequest | REST (HTTP/1.1 + JSON) |
| Human Debuggability | Requires specialized tools to decode binary | Trivial: plain text inspectable in DevTools and curl | REST (HTTP/1.1 + JSON) |
When to Choose gRPC (HTTP/2 + Protobuf):
- •Internal backend-to-backend microservices communication
- •Real-time telemetry and high-throughput streaming systems
- •Polyglot systems requiring strictly typed cross-language contracts
When to Choose REST (HTTP/1.1 + JSON):
- •Public-facing web and mobile consumer APIs
- •Services where standard HTTP caching and simple browser testing are required
- •Third-party developer developer portals and webhooks