input-boundary-guardrails

What problem does it solve?

Backend input validation and type safety guardrails that MUST be activated before writing or modifying ANY API route handlers that accept external input. They enforce boundary normalization, canonical types, fail-fast validation, and single-source parsing to prevent runtime errors from untrusted data.

Core Features & Use Cases

• Boundary normalization and centralized helpers (to_int, to_date, to_bool)
• Fail-fast validation with explicit error messages across route handlers
• Clear internal contracts and canonical types guiding service logic
• Use Case: ensure external inputs (query params, JSON bodies, headers) are safe before business logic runs.

Quick Start

Apply the input boundary guardrails to your API routes and normalize all external inputs at the boundary before any processing.