HazelJS Recipes

Every package documentation page includes a Recipes section at the bottom with 2–3 task-oriented, copy-paste-ready TypeScript examples. This page indexes all recipes by category for quick navigation.

Each recipe follows this format:

Complete TypeScript with all imports
File path comment (// File: src/...)
No pseudo-code — every snippet is runnable

Core

Recipe	Package
Build a CRUD REST API	`@hazeljs/core`
Add Validation to a POST Endpoint	`@hazeljs/core`
Add an Auth Guard	`@hazeljs/core`
Write a Unit Test	`@hazeljs/core`

AI & Intelligence

Recipe	Package
Chat Endpoint with Streaming	`@hazeljs/ai`
Multi-Provider Fallback	`@hazeljs/ai`
AI-Powered DTO Validation	`@hazeljs/ai`
Customer Support Agent with Tools	`@hazeljs/agent`
Multi-Agent Pipeline with AgentGraph	`@hazeljs/agent`
Agent with RAG Context	`@hazeljs/agent`
Ingest Documents and Search	`@hazeljs/rag`
RAG-Powered Q&A Endpoint	`@hazeljs/rag`
Hybrid Search with Reranking	`@hazeljs/rag`
Store and Retrieve User Preferences	`@hazeljs/memory`
Conversation Memory with RAG Adapter	`@hazeljs/memory`
Versioned Prompt with Variables	`@hazeljs/prompts`
A/B Test Prompts	`@hazeljs/prompts`
Order Processing Workflow	`@hazeljs/flow`
Start a Flow from a Controller	`@hazeljs/flow`
Start Flow Runtime Programmatically	`@hazeljs/flow-runtime`
Trigger a Flow via REST from Another Service	`@hazeljs/flow-runtime`
Voice AI WebSocket Gateway	`@hazeljs/realtime`
Text-to-Speech Endpoint	`@hazeljs/realtime`
Expose a Database Query as an MCP Tool	`@hazeljs/mcp`
MCP Server with Multiple Tools	`@hazeljs/mcp`
Block Prompt Injection on a Chat Endpoint	`@hazeljs/guardrails`
Redact PII from LLM Output	`@hazeljs/guardrails`
Sentiment Analysis Model	`@hazeljs/ml`
Serve ML Predictions via REST	`@hazeljs/ml`
Feature Store with Online/Offline Access	`@hazeljs/ml`
Trigger Incident Response from a Controller	`@hazeljs/ops-agent`
Configure Ops Agent with Jira and Slack	`@hazeljs/ops-agent`
Convert a PDF to Audio via REST	`@hazeljs/pdf-to-audio`
Background PDF Conversion with Queue	`@hazeljs/pdf-to-audio`

Web & API

Recipe	Package
Audit Business Events	`@hazeljs/audit`
Global HTTP Audit Logging	`@hazeljs/audit`
JWT-Protected CRUD Controller	`@hazeljs/auth`
Register and Login Endpoints	`@hazeljs/auth`
Record-Level Permission Check	`@hazeljs/casl`
Ability Factory for Roles	`@hazeljs/casl`
Google OAuth Login	`@hazeljs/oauth`
Stripe Checkout Session	`@hazeljs/payment`
Handle Stripe Webhooks	`@hazeljs/payment`
Add Swagger to Your App	`@hazeljs/swagger`
Document a Controller with Decorators	`@hazeljs/swagger`
Chat Room with WebSocket	`@hazeljs/websocket`
Authenticated WebSocket Gateway	`@hazeljs/websocket`
GraphQL Query and Mutation	`@hazeljs/graphql`
Register GraphQL Module	`@hazeljs/graphql`
gRPC Service and Client	`@hazeljs/grpc`

Data & Storage

Recipe	Package
CRUD Service with Prisma	`@hazeljs/prisma`
Transaction with Multiple Models	`@hazeljs/prisma`
Entity with Repository Pattern	`@hazeljs/typeorm`
Register TypeORM Module	`@hazeljs/typeorm`
Cache Database Queries	`@hazeljs/cache`
Cache AI Responses to Reduce Cost	`@hazeljs/cache`
ETL Pipeline for CSV Import	`@hazeljs/data`
Run a Pipeline from a Controller	`@hazeljs/data`

Infrastructure

Recipe	Package
Typed Configuration with Validation	`@hazeljs/config`
Inject Config in a Service	`@hazeljs/config`
Feature-Flagged Route	`@hazeljs/feature-toggle`
Branch Logic with Feature Flags	`@hazeljs/feature-toggle`
Enable Inspector Dashboard	`@hazeljs/inspector`
Custom Inspector Metadata	`@hazeljs/inspector`
Scaffold a New Project	`@hazeljs/cli`
Generate Components	`@hazeljs/cli`
Localized REST API Responses	`@hazeljs/i18n`
Register i18n Module with JSON Translations	`@hazeljs/i18n`
AWS Lambda Handler	`@hazeljs/serverless`
Google Cloud Function Handler	`@hazeljs/serverless`
Scheduled Database Cleanup	`@hazeljs/cron`
Register Cron Module	`@hazeljs/cron`
Email Queue with Processor	`@hazeljs/queue`
Register Queue Module with Redis	`@hazeljs/queue`
Offload Image Processing to a Worker	`@hazeljs/worker`
API Gateway with Route Versioning	`@hazeljs/gateway`
Canary Deployment via Gateway	`@hazeljs/gateway`
Circuit Breaker on an External API Call	`@hazeljs/resilience`
Rate Limiter on a Controller	`@hazeljs/resilience`
Register and Discover Services	`@hazeljs/discovery`
Emit and Listen to Domain Events	`@hazeljs/event-emitter`
Cache Invalidation via Events	`@hazeljs/event-emitter`
Kafka Producer and Consumer	`@hazeljs/kafka`
Register Kafka Module	`@hazeljs/kafka`
Slack Bot with AI Responses	`@hazeljs/messaging`
Multi-Channel Bot Registration	`@hazeljs/messaging`