API design is the process of determining and exposing a set of consistent method signatures, return values, and documentation intended for use by other developers to allow programmatic access to data.

An API (Application Programming Interface) is what developers use to work with a specific software or platform. API design refers to those practices that lead to developing a good API. A good API design helps developers leverage the full power of your platform while being easy to use. A bad API design can hinder developers from utilizing the full power of your platform and in the worst case can drive developers away from your platform because of its difficulty.

API design shares many concepts with normal programming best practices. A few of these are separation of concerns and prevention of abstraction leakage.

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