@fastify/helmet vs OWASP API Security Top 10: Side-by-Side Comparison (2026)

Short answer

Fastify teams building APIs that need HTTP header security without operational overhead should start with @fastify/helmet; it's a thin wrapper around the battle-tested helmet library, meaning you get OWASP Top 10 mitigations (CSP, HSTS, X-Frame-Options) with minimal configuration beyond `fastify.register()`. The 453 GitHub stars and zero-friction npm install make adoption frictionless for small-to-mid teams. Skip this if you need dynamic policy management, request-level header mutation, or centralized policy enforcement across multiple services; @fastify/helmet is intentionally static and Fastify-bound, not a gateway or orchestration tool. Security architects and API platform teams building threat models or audit checklists should start with OWASP API Security Top 10; it's the only free reference that maps real exploits to specific API patterns rather than generic web risks. The list is maintained by vendors and practitioners across 15+ companies, so it reflects what's actually breaking in production, not theoretical attack surface. Skip this if you need automated scanning or remediation; it's a framework for thinking, not a tool that runs in your pipeline.