How Encoding Permissions Into API Types Can Eliminate Authorization Bugs

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A software architecture discussion on DEV Community explores a design approach where API permissions are embedded directly into a program's type system rather than handled as separate runtime checks. In most systems, authorization logic is scattered across controllers, middleware, and services, making it easy for developers to accidentally call operations without the required permission checks. The proposed alternative uses typed capability structs — such as a DeleteUser type — that can only be constructed after authorization is verified, forcing the compiler to reject unauthorized operations at build time. This shifts the security guarantee from developer discipline to the type checker itself, making certain unauthorized calls structurally impossible to express. The article argues this approach connects backend API design to concepts like capability-based security, domain-driven design, and type theory, and represents a promising direction for safer distributed systems.

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