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Frameworks & web · #fastify
Learn how Fastify uses Ajv and fast-json-stringify to move serialization overhead from runtime to startup, significantly increasing API throughput and security.
Use JSON Schema as the contract in Fastify for automatic request validation with AJV and pre-compiled response serialization with fast-json-stringify, scoped inside encapsulated plugins for modular, type-safe routes.
Step‑by‑step guide to create a Fastify plugin that adds a scoped decorator, validates JSON schemas, logs with Pino, and verifies encapsulation.
Fastify's plugin encapsulation scopes decorators and hooks — but never routes. Learn what it actually isolates, how to share deliberately with fastify-plugin, and how to verify it.
Learn how declaring a JSON Schema for a Fastify route’s response lets the framework compile a custom serializer that strips unwanted fields, validates output, and feeds OpenAPI docs—all without hand‑rolled stringify logic.
Fastify's declarative JSON Schema validation eliminates per-route validation boilerplate, produces consistent error responses, and compiles to fast runtime checks. A worked example shows the pattern, plus trade-offs for dynamic rules and large schemas.
Fastify validates requests at the C++ parser level using JSON Schema draft-06, rejecting bad payloads before handlers run. Encapsulation scopes prevent schema ID collisions across plugins. A worked example shows validation, serialization, and verification steps.
Learn how to use Fastify's JSON Schema validation and serialization to eliminate boilerplate error handling and optimize response performance via pre-compiled schemas.
A step‑by‑step diagnostic guide for Fastify hanging requests: identify the stalled lifecycle phase, map symptoms to root causes (missing reply.send, event‑loop blocking, non‑async middleware, uncaught errors, memory leaks), apply targeted fixes, and verify with clinic.js and autocannon.
nodejs