Create Cloudflare Workers Edge Functions

Create Cloudflare Workers edge functions for [APPLICATION_NAME] with the following specifications:

Requirements

• Application name: [APPLICATION_NAME]
• API endpoints: [ENDPOINT_1], [ENDPOINT_2], [ENDPOINT_3]
• HTTP methods: [GET/POST/PUT/DELETE]
• KV storage needed: [YES/NO]
• KV namespaces: [NAMESPACE_1], [NAMESPACE_2]
• Caching strategy: [Cache everything/Selective/None]
• Cache TTL: [SECONDS]
• CORS configuration: [Allow all origins/Specific origins]
• Allowed origins: [ORIGIN_1], [ORIGIN_2]
• Environment variables: [VAR_1], [VAR_2], [VAR_3]
• External APIs to proxy: [API_1], [API_2]
• Rate limiting: [YES/NO]

Deliverables

Generate complete Cloudflare Workers code with:

Main worker file (index.ts):

• Default export with fetch() handler
• Request/Response handling
• Env interface with all bindings

Router setup using itty-router:

• Router instance creation
• Route definitions for all [ENDPOINTS]
• HTTP method handlers (GET, POST, PUT, DELETE)
• Request parsing (JSON, FormData, text)
• Response formatting with proper headers
• Error handling middleware
• 404 handler for unknown routes

KV storage operations if needed:

• Env interface with KV namespace bindings
• GET operations: read from [NAMESPACES]
• PUT operations: write with optional TTL
• DELETE operations: remove keys
• LIST operations: query keys by prefix
• JSON value handling (stringify/parse)
• Error handling for KV operations

Caching implementation if [CACHING_STRATEGY]:

• Cache API usage with caches.default
• Cache key generation
• Cache matching logic
• Cache-Control headers with [CACHE_TTL]
• Cache invalidation strategy
• Conditional caching based on request/response

CORS configuration:

• CORS headers object with [ALLOWED_ORIGINS]
• OPTIONS method handler for preflight
• Apply CORS headers to all responses
• Credentials support if needed
• Custom allowed methods and headers

Environment variable handling:

• Env interface with all [ENV_VARS]
• Type-safe access to environment variables
• Validation of required variables
• Usage in API calls and logic

External API proxying for [EXTERNAL_APIS]:

• Fetch calls to external services
• Request header forwarding
• Response streaming
• Error handling and fallbacks
• Timeout handling

Rate limiting if needed:

• KV-based rate limiting per IP/user
• Sliding window algorithm
• Rate limit headers (X-RateLimit-*)
• 429 response when exceeded

TypeScript types:

• Env interface for all bindings
• Request/Response types
• Custom types for data structures

wrangler.toml configuration:

• Worker name
• KV namespace bindings
• Environment variables
• Compatibility settings
• Routes configuration

Output production-ready Cloudflare Workers code ready to deploy with wrangler.