abac

Build an ABAC policy engine in TypeScript with the builder pattern, conditional permissions, and type-safe policy evaluation that replaces RBAC's limitations.

Extend ABAC with environment-based rules, field-level read and write permissions, and automatic database query filtering that eliminates duplicate permission logic.

Add multi-tenant isolation to your permission system, evaluate CASL as a library alternative, and use decision frameworks to choose the right authorization architecture.

A comprehensive security reference with implementation context, lessons learned, and practical guidance from production systems.