API Security Testing Checklist for Development Teams
Security Boulevard, Tuesday, October 27th, 2026
A practical API security testing checklist covering inventory, authentication, authorization, input validation and CI/CD automation.
This Clear Path Security post on Security Boulevard offers an API security testing checklist for development teams, aimed especially at UK SMEs and aligned with OWASP ASVS and Microsoft SDL.
It starts with a full inventory of endpoints, authentication requirements and trust boundaries, since shadow APIs and legacy versions often go untested.
Core areas include token validation and revocation, object-level authorization (BOLA), input validation and mass assignment, excessive data exposure, rate limiting, TLS and gateway behavior, safe logging, and secrets and third-party integrations.
It advises automating contract and negative tests in CI/CD against production-like environments and treating unauthorized data access or secret leakage as release blockers.