Microservices Communication: REST, gRPC, and Message Queues

Microservices Communication: REST, gRPC, and Message Queues Your microservices call each other via HTTP. One service goes down. Cascading failures bring everything down. Here is how to pick the right communication pattern. Synchronous: REST and gRPC REST : Simple, universal, human-readable. Best for CRUD operations and public APIs. gRPC : Binary protocol (Protocol Buffers), type-safe, bidirectional streaming. Best for internal service-to-service calls where performance matters. // REST: ~50ms per call, text-based GET /api/users/123 // gRPC: ~5ms per call, binary, auto-generated clients service UserService { rpc GetUser (GetUserRequest) returns (User); } Asynchronous: Message Queues For operations that do not need an immediate response: // Producer: fire and forget await queue . add ( " send-email " , { to : user . email , template : " welcome " }); res . json ({ status : " accepted " }); // Respond immediately // Consumer: processes independently worker . process ( " send-email " , asy