Hiding UI Elements Is Not Enough: Frontend Apps Must Also Gate API Requests

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A common frontend security oversight involves hiding unauthorized UI elements while still allowing the underlying API requests to fire, exposing backend endpoints to potential attackers. Proper frontend authorization requires three distinct layers: controlling what users see, preventing unauthorized data fetches, and enforcing permissions on the server side. In React Query, for example, omitting the 'enabled' flag on a useQuery hook means the request executes before any permission check runs, returning a 403 error and revealing that the endpoint exists. Developers are advised to gate requests at the data layer by conditionally enabling queries only after confirmed permissions, and to avoid optimistic access assumptions that can briefly expose restricted UI elements. Addressing all three authorization gates improves security posture, reduces server load, and ensures the frontend accurately reflects backend access rules.

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