Learn FASTIFY with Real Code Examples
Updated Nov 25, 2025
Architecture
Node.js event-loop-based runtime
Request/response lifecycle hooks
Encapsulated plugin-based modules
Built-in schema validation for routes
Integration with logging and monitoring tools
Rendering Model
Client sends HTTP request -> Fastify app
Lifecycle hooks process request
Route handler generates response
Fast JSON serialization optimizes output
Response sent back to client
Architectural Patterns
Plugin encapsulation for modularity
Schema-based request/response validation
Lifecycle hooks for request processing
Event-loop non-blocking I/O
Integration-friendly with other Node.js modules
Real World Architectures
High-performance REST APIs
Microservices backend for web/mobile apps
IoT data ingestion servers
Authentication and authorization services
Real-time applications using WebSockets
Design Principles
High-performance HTTP handling
Schema-driven input/output validation
Plugin-based modular architecture
Developer-friendly hooks and lifecycle management
Integration-friendly with Node.js ecosystem
Scalability Guide
Cluster Fastify processes for high load
Use caching layers for performance
Load balance across multiple instances
Modularize with plugins for maintainability
Monitor performance using Pino or other tools
Migration Guide
Adapt from Express if moving to Fastify
Rewrite middleware as hooks
Use JSON schema for request validation
Replace incompatible Express plugins
Test endpoints for schema compliance