Learn FASTIFY with Real Code Examples
Updated Nov 25, 2025
Installation Setup
Install Node.js 16+
Initialize project with `npm init`
Install Fastify via `npm install fastify`
Create main server file (e.g., `server.js`)
Run server with `node server.js` or nodemon
Environment Setup
Install Node.js 16+
Initialize project with npm
Install Fastify and plugins
Configure development tools (nodemon, ESLint)
Verify server runs locally
Config Files
package.json - project dependencies
server.js - main server file
routes/ - route definitions
plugins/ - reusable Fastify plugins
schemas/ - JSON validation schemas
Cli Commands
npm init -> initialize project
npm install fastify -> install Fastify
node server.js -> run server
nodemon server.js -> auto-reload
npm install --save-dev typescript -> add TypeScript support
Internationalization
i18n plugin for multi-language responses
Supports UTF-8 encoding
Serve locale-specific data per request
Integrates with translation libraries
Used globally in multilingual applications
Accessibility
Framework-agnostic for clients
Supports CORS via plugin
Accessible via HTTP clients
Works on all Node.js-supported platforms
Middleware ensures security and headers
Ui Styling
Not handled - backend framework only
Serve static files or templates
Integrate with frontend frameworks
Respond with JSON for APIs
Dynamic pages via template engines if needed
State Management
Stateless by default
Sessions via JWT or cookie plugins
Encapsulation using plugins
Database for persistent state
Cache with Redis or memory stores
Data Management
Parse JSON and URL-encoded payloads
Validate input using JSON schemas
Connect to SQL/NoSQL databases
Cache frequently accessed data
Log requests and responses with Pino