Workers Development

Purpose

This skill provides comprehensive guidance for developing Cloudflare Workers, including runtime APIs, fetch event handlers, request/response handling, bindings usage, and common development patterns. Use this skill when implementing Workers code, designing Workers architecture, or working with the Workers runtime environment.

Workers Runtime Overview

Cloudflare Workers run on the V8 JavaScript engine at the edge. Workers use the Service Worker API with extensions specific to the Cloudflare platform.

Key Characteristics

• Isolate-based architecture: Each request runs in an isolated V8 context, not a container
• Fast cold starts: Sub-millisecond startup time due to isolate architecture
• Automatic scaling: No configuration needed, scales to millions of requests
• Global deployment: Code runs at 300+ Cloudflare data centers worldwide
• Standards-based: Uses Web APIs (fetch, Request, Response, Headers, etc.)

Execution Model