midPWA
What is Service Worker lifecycle?
Updated May 17, 2026
Short answer
It includes install, activate, and fetch phases.
Deep explanation
Service Workers go through install (cache setup), activate (cleanup old caches), and fetch (request interception).
Real-world example
Updating PWA versions in production apps.
Common mistakes
- Not handling old cache cleanup.
Follow-up questions
- What triggers activation?
- Can SW skip lifecycle?