What are the advantages and disadvantages of the backend for frontend (BFF) approach?

Advantages:

• Client-specific customization: BFF allows creating an API optimized for a specific client (web, mobile app, etc.), reducing the amount of data transmitted over the network and simplifying frontend logic.
• Isolation of changes: Changes in the backend API do not necessarily affect the frontend, as BFF can adapt responses to the client's needs.
• Flexibility in working with different data sources: BFF can aggregate data from multiple backend services, providing a convenient unified API to the frontend.
• Performance improvement: BFF can perform some operations (e.g., data aggregation, transformation) on the server side, reducing client load and speeding up data loading.
• Client-specific logic: Allows placing logic that is specific to only one type of client, isolating it from the main business logic.

Disadvantages:

• Architecture complexity: Introducing an additional layer (BFF) increases system complexity and requires extra effort for development, deployment, and maintenance.
• Logic duplication: Some logic may be duplicated in BFF and the main backend if clear responsibility separation is not considered.
• Increased latency: An additional network hop between the frontend and the main backend through BFF may slightly increase latency.
• Additional resource requirements: Each BFF instance requires its own computational resources.
• Entry barrier: Developing and maintaining BFF requires specific skills for server-side work.