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In my node.js chat app, I want to save chat data in offline mode and push notification when online. Basic chat app is done. I'm using ws node module for server code. In client side code, I want to use service worker for storing offline data. I have done some home work https://jakearchibald.com/2014/offline-cookbook/ https://ole.michelsen.dk/blog/making-an-offline-webapp-with-service-workers.html, but I think I don't understand how can I store chat data in service worker offline data.
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LocalStorage is not accessible from web workers or service workers. Cookies have their uses, but should not be used for storage.
Using a Service worker you can easily set an app up to use cached assets first, thus providing a default experience even when offline, before then getting more data from the network (commonly known as Offline First).
IndexedDB is a general purpose database that's available client-side in both the service worker and main web page context. I'd suggest using that to store data like chat messages.
There are a number of libraries out there that wrap IndexedDB to make the interface friendlier. A relatively newer one, idb, has the advantage of providing a promise-based interface, which comes in handy when using IndexedDB from a service worker, since so much of the asynchronous code there is already promise-based.
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