REST and gRPC are both popular choices for building APIs, but they have different strengths and weaknesses. Here’s a comparison to help you choose the right one for your needs:


  • REST: Follows the Representational State Transfer principles, making APIs resource-oriented with standardized verbs like GET, POST, PUT, and DELETE.
  • gRPC: Utilizes a Remote Procedure Call (RPC) model, focusing on function calls rather than resources.

Data format:

  • REST: Primarily uses JSON and occasionally XML for data exchange, offering easy integration with browsers and various tools.
  • gRPC: Employs Protocol Buffers, a binary format enabling smaller payload sizes and faster serialization/deserialization.


  • REST: Primarily supports request-response interactions, though variations like WebSockets enable limited streaming.
  • gRPC: Offers full duplex streaming, allowing continuous data exchange in both directions.


  • REST: Performance can be good for simple APIs, but larger payloads and JSON parsing can become bottlenecks.
  • gRPC: Generally faster due to smaller, binary data and efficient serialization.

Other factors:

  • Learning curve: REST is easier to learn and work with due to its familiarity and broader tooling support.
  • Language support: Both offer diverse language support, with gRPC potentially requiring specialized libraries for some languages.
  • Flexibility: REST is more flexible and adaptable to changing requirements, while gRPC requires stricter contracts and upfront API definition.

Use cases:

  • REST: Ideal for public-facing APIs, browser integration, and interacting with diverse languages and platforms.
  • gRPC: Excellent for internal APIs, microservices communication, high-performance needs, and real-time applications.

The simple explanation is like thisr

Imagine two restaurants: RESTaurant and gRPCafe.


  • You order from a menu (list of API endpoints).
  • Each dish (data) comes on a separate plate (individual request-response).
  • You can only order one dish at a time.
  • The waitstaff (server) can’t bring you more food until you ask again.
  • Everyone can eat there (easy integration with different tools and platforms).


  • You tell the barista (server) exactly what you want (function call).
  • You get your drink (data) directly in your cup (full duplex streaming).
  • You can keep talking to the barista and get refills instantly.
  • It’s a bit more exclusive (requires specific code), but the drinks are served much faster.

So, which one is better?

  • RESTaurant: Good for casual dining, sharing your meal with others (public APIs), and trying new things (flexible for changing needs).
  • gRPCafe: Perfect for a quick coffee break, getting exactly what you need (high performance), and keeping the conversation flowing (real-time communication).
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