Writing OpenAPI Endpoints with Chanfana

When to Use

Use this skill when:

• Building OpenAPI endpoints with chanfana for Cloudflare Workers
• Defining request/response schemas with Zod v4
• Creating CRUD auto endpoints (Create, Read, Update, Delete, List)
• Integrating with Cloudflare D1 databases
• Implementing error handling with exception classes

Part 1: Fundamentals

Quick Start with Hono

import { Hono, type Context } from 'hono';
import { fromHono, OpenAPIRoute, contentJson } from 'chanfana';
import { z } from 'zod';