schema-boundary-typing

Runtime validation of untrusted API payloads in TypeScript applies a schema check at the boundary to enforce truthful types. You keep data as unknown until validation passes, preventing invalid shapes from entering your codebase.

Keeping TypeScript types aligned with webhook payloads requires deriving static types directly from runtime schemas. This schema-first approach ensures the static type matches the actual validated input, reducing ad-hoc typing throughout the codebase.

Keeping incoming JSON as unknown before schema validation forces an explicit runtime check at the boundary. This prevents untrusted data from being treated as a safe type prematurely, avoiding runtime errors and fragile boundaries downstream.

Enforcing runtime types at the edge uses your repository's existing validator or guard patterns. The skill applies available schema-first patterns rather than introducing a new external dependency.

Testing invalid payloads against TypeScript boundary validation involves passing malformed data to the schema check to verify rejection. This ensures the runtime guard correctly blocks untrusted inputs at HTTP requests, webhooks, and storage reads.

Schema boundary typing applies across HTTP requests, webhook payloads, and storage reads to ensure consistent boundary behavior. It validates untrusted JSON parsing by applying the same runtime schema check at every data entry point.