Caching SVG Assets with a Service Worker

Progressive Web Apps need their icons and graphics available offline — a Service Worker cache strategy makes that reliable.

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Choosing a Cache Strategy for SVGs

SVG icons rarely change once deployed, making 'Cache First' the ideal strategy: the Service Worker serves the cached version instantly without a network round-trip, falling back to network only on a cache miss. This differs from HTML content, which often needs 'Network First' for freshness — icons prioritize speed and offline reliability instead.

Cache First strategy suits rarely-changing SVG icon assets
Instant serving from cache with network as the fallback path
Contrast with Network First, more appropriate for dynamic HTML content

Precaching with Workbox

Workbox's `precacheAndRoute()` combined with a build-time manifest of your app's icon SVGs ensures every critical graphic is cached on install, before the user ever goes offline — pair this with a runtime `CacheFirst` strategy for any dynamically loaded SVGs not known at build time.

Workbox precacheAndRoute() caches known icons at install time
Runtime CacheFirst strategy handles dynamically loaded SVGs
Precaching guarantees offline availability before first offline use

Frequently Asked Questions

Will a Cache First strategy ever serve a stale, outdated icon?

Only if you deploy an icon update without changing its URL/filename. Use versioned or hashed filenames for icons, so an update naturally becomes a cache miss for the new URL rather than serving stale content indefinitely.

Do I need Workbox, or can I write the Service Worker manually?

Workbox simplifies common patterns significantly, but a manual Service Worker with a simple cache.addAll() and a fetch event listener implementing cache-first logic works fine for a small, straightforward icon set.

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