service-worker

Implement a service worker for offline caching and updates in Progressive Web Apps.

Updated Apr 9, 2025

Search Tags:#web-performance #service-worker #PWA #cache-management #offline-caching #update-strategy

Ready to run

npx skills add https://github.com/f-elix/ironkit --skill service-worker-f-elix

💬 Prompt for ChatGPT / Claude Chat▼

Please help me install this Agent Skill.
Skill: service-worker
Source: https://github.com/f-elix/ironkit/tree/main/.cursor/skills/service-worker
Command: npx skills add https://github.com/f-elix/ironkit --skill service-worker-f-elix

SYSTEM DOCUMENTATION & REQUIREMENTS

What problem does it solve?

This Skill provides a robust service worker implementation to enable offline capability and reliable caching for Progressive Web Apps, improving reliability and performance in unreliable networks.

Core Features & Use Cases

Caches static assets and prerendered pages for offline access.
Applies a network-first strategy for dynamic content to balance freshness and resilience.
Manages caches with versioning and automatic cleanup during activation.
Enables immediate updates via skip-waiting to minimize downtime.

Quick Start

Register and load the service worker in your application startup: navigator.serviceWorker.register('/service-worker.js') Ensure the worker is included in the build and served at the correct path.

Frequently Asked Questions about service-worker

High-intent search queries and answers about installing and using this skill.

FAQPage Schema

How do I implement offline caching for a Progressive Web App?▼

Offline caching for a Progressive Web App is implemented using a service worker that caches static assets and prerendered pages. It automatically handles cache versioning and cleanup during activation to ensure reliable content delivery.

What is the best way to manage service worker cache versioning and updates?▼

Service worker cache versioning and updates are managed by enabling skip-waiting for immediate activation and performing automatic cache cleanup on activation. This approach minimizes downtime and removes outdated cached resources.

Does this service worker handle dynamic content differently from static assets?▼

Dynamic content is handled differently from static assets by applying a network-first strategy. This balances content freshness with resilience, falling back to cached responses only when the network fails.

Can I use this service worker for non-GET requests or extension URLs?▼

This service worker cannot be used for non-GET requests or extension URLs. It enforces GET-only requests and specifically caches 200 responses for non-extension URLs to ensure reliable offline behavior.

How do I register a service worker for PWA offline support?▼

To register a service worker for PWA offline support, include it in your build and call navigator.serviceWorker.register('/service-worker.js') in your application startup. Ensure it is served at the correct root path.

Why do I need an offline fallback in my web application?▼

You need an offline fallback in your web application to improve reliability and performance in unreliable networks. It ensures users can still access cached static assets and prerendered pages when connectivity drops.