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Fix the driver behind crashes, sound loss and screen glitchesFind Drivers →Repair Windows errors before they cause bigger problemsFix Now →You can add service-worker-based offline support without writing the worker yourself: use vite-plugin-pwa with a Vite app, or Angular’s ng add @angular/pwa setup with an Angular CLI app. The tooling can generate and register a worker, but you still need to decide which resources and routes should work offline—and design separately for app data and offline actions.
Choose the setup for your framework
| Project | Documented setup | What it gives you |
|---|---|---|
| Vite | vite-plugin-pwa, starting with its generated-worker approach |
Can generate the manifest and service worker and register the worker; caching behavior is configured for your app. |
| Angular CLI | ng add @angular/pwa |
Adds Angular’s service-worker support, build integration, registration, PWA metadata and icons, plus ngsw-config.json for caching behavior. |
These are stack-specific paths, not interchangeable commands for every web framework. For Vite, see the Vite PWA getting-started guide; for Angular CLI, see Angular’s service-worker setup guide.
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What “offline support” actually covers
A service worker can make resources available from a cache when the network is unavailable. That does not automatically make every page, API response, or user workflow function offline. Decide which static resources to cache, what should happen on navigation to a page that is not cached, and how important external assets behave without a connection.
Static app-shell caching and application data are separate concerns. The cited setup guides demonstrate caching application resources; they do not establish that authenticated API workflows, user data, or offline writes are automatically available. If users must view or change data offline, define that behavior explicitly—including how changes are stored and what happens when the app reconnects.
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Set up offline support in a Vite app
Install and configure the plugin
For a Vite project, install vite-plugin-pwa as a development dependency, then add VitePWA() to the Vite configuration as shown in the official guide. Its minimal setup generates and injects a web app manifest, generates a service worker, and registers it. The plugin uses the workbox-build Node library.
Start with the generated-worker strategy, generateSW, if its built-in behavior and configuration meet your caching needs. Configure which resources are precached or runtime-cached rather than assuming every asset or route is covered by default. Check the project’s README for the compatibility requirements of the release you select; requirements vary by version.
Configure routes and external assets
Review the Workbox generateSW documentation for options such as runtime caching, third-party fonts, and navigation-fallback exclusions. If you exclude a route through navigateFallbackDenylist, provide another offline behavior for that route; it will not receive the navigation fallback. Likewise, assets served from a CDN need appropriate caching configuration if they must load offline.
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Vite PWA’s injectManifest mode lets you supply custom service-worker logic and injects the precache manifest during the build. It offers more control, but means authoring and maintaining worker code—the opposite of the simplest no-hand-written-worker path. The Workbox injectManifest documentation recommends checking whether generateSW is sufficient first.
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Set up offline support in an Angular CLI app
Add Angular’s service worker
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From the Angular CLI project, run
ng add @angular/pwa. -
Review the generated
ngsw-config.jsonand adjust its resource groups and paths to match the app’s build output and offline requirements. -
Build the app using the production configuration, then serve that output for testing.
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The CLI adds the Angular service-worker package and build support, imports and registers the worker, updates index.html with manifest and theme-color metadata, and installs PWA icons. Angular’s setup guide lists default cached resources such as index.html, the favicon, JavaScript and CSS build artifacts, assets, and certain images and fonts. The default image and font extension list is limited; adjust it if your app’s output paths or file types differ.
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Understand Angular’s versioned cache
Angular generates a hashed ngsw.json manifest from ngsw-config.json. Its service worker treats the cached application as a coherent version rather than mixing files from different versions. When an update is available, it downloads changed resources; an already-running version may continue to be served until a later load or refresh switches to the new version. See the Angular service-worker overview for the versioning model.
Deploy securely and keep a no-worker fallback
For production, serve the app over HTTPS. Angular’s service-worker overview states: “For service workers to be registered, the application must be accessed over HTTPS, not HTTP.” Localhost is an exception for development. The same overview notes that a browser without service-worker support will not register the worker or provide its offline cache management, so the app should remain usable without it. Test the browsers your users rely on rather than assuming offline support everywhere.
Verify the offline experience
-
Serve a production-like build from an environment that supports service workers. Angular’s setup guide demonstrates serving a production build over HTTP on localhost, which qualifies as a secure context.
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Open the app while online and allow the worker to install and cache its configured resources.
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In browser developer tools, disable the network. Angular’s guide demonstrates the Network tab’s Offline throttling setting.
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Reload and inspect network requests. Confirm that the resources you expect are being served from the service-worker cache.
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Test important routes, CDN assets, and any offline data or form workflow individually; a cached app shell does not prove those cases work.
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Redeploy a changed build and check that update behavior is acceptable and does not leave users with incompatible resources. For Angular, verify its documented version switch; for Vite, check the behavior configured for the project.
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During debugging, try a private browser window to reduce confusion from a previously installed worker or stale cache.
Common setup mistakes to avoid
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Expecting one plugin command to work for every framework: use the Vite or Angular path that matches the project; other frameworks need their own documented setup.
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Treating generated code as a complete offline product: generation handles worker setup, not every route, external asset, API, or data workflow.
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Testing only the development server: verify the production build and actual network-disabled behavior.
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Assuming updates appear immediately: update timing depends on the framework and configuration; test it after a real redeployment.
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