write-endpoints

To build OpenAPI endpoints for Cloudflare Workers, use the Chanfana framework to define API routes with Zod v4 schemas. Chanfana handles request validation, automatic CRUD operations, and generates OpenAPI documentation automatically.

Yes, Chanfana works with both Hono and itty-router to create OpenAPI-compliant APIs. The framework provides detailed integration examples for both routers, allowing you to define endpoints, validate requests with Zod, and manage exceptions.

Chanfana supports automatic CRUD operations integrated directly with Cloudflare D1 databases. You can generate standard Create, Read, Update, Delete, and List operations automatically while maintaining schema validation through Zod v4 definitions.

The best way to validate API requests in Cloudflare Workers is using Zod v4 schemas with Chanfana. This approach automatically validates various data types against your OpenAPI specifications, ensuring robust request validation before processing.

To handle exceptions in OpenAPI endpoints on Cloudflare Workers, Chanfana provides predefined exception classes for robust error management. Implementing these predefined exceptions ensures consistent error responses across your API routes.