@fastify/helmet vs @fastify/rate-limit: 2026 Comparison

@fastify/helmet

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.

@fastify/rate-limit

Teams building Node.js APIs who need rate limiting without the operational overhead of a separate service should reach for @fastify/rate-limit. The plugin ships as a native Fastify middleware with sub-millisecond latency overhead, making it practical for high-throughput routes where traditional gateway-level rate limiting adds unacceptable latency. Not for buyers who need distributed rate limiting across multiple instances without in-memory state coordination or those who require sophisticated quota management beyond simple request-per-window rules.