What is the BFF (Backend for Frontend) pattern? Its advantages and disadvantages?

The BFF (Backend for Frontend) pattern is an architectural approach where a separate backend is created for each type of client application (e.g., web, mobile), optimized for the needs of that client.

Pros:

• Allows tailoring the API to specific frontend requirements, reducing data redundancy.
• Simplifies frontend development, as the backend provides exactly the data and logic needed.
• Enables isolating changes in one BFF without affecting other clients.

Cons:

• Increases the number of services, complicating support and deployment.
• May lead to duplication of logic between different BFFs.
• Requires additional resources for development and maintenance of each BFF.

Example: a mobile application and a web application have different BFFs, each aggregating data from shared microservices but providing an API optimized for a specific client.