On what principle was REST or gRPC chosen in your projects?

The choice between REST and gRPC in projects is usually based on performance requirements, compatibility, and development convenience.

REST is suitable when simplicity, broad support, and easy integration with various clients (browsers, mobile applications) are important. It uses HTTP/1.1 and the text-based JSON format, which facilitates debugging and monitoring.

gRPC is chosen when high performance, low latency, and strict typing are needed. It uses HTTP/2 and the binary Protobuf protocol, which reduces network load and speeds up data exchange. It is especially useful for microservice architecture within infrastructure, where all services trust each other.

Example: if a service needs to serve external clients on different platforms, REST is chosen. If it is internal high-load services with many calls, gRPC is preferable.