- Added conditional request logging, a custom compiler for faster loading, and switched to the native WebStream API for improved performance.
- Extensive documentation updates, including migration guide with a breaking datetime change, security threat model, validation/serialization guidance, and various guide corrections.
- Fixed numerous bugs and type issues such as status code handling, JSON escaping, routerOptions typing, send payload requirements, and AJV option validation.
v5.7.0
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Fix for two Fastify security advisories (GHSA‑w2qp‑rph6‑63g4 and GHSA‑3m5p‑2c4r‑xxw2).
Added per‑route logging for Google Cloud Functions and introduced `Reply.prototype.mediaType` for easier content‑type handling.
Fixed trailer state clearing when removing all trailers and corrected requestCompleted handling to use null instead of undefined.