Need to store a lot data on the client-side, in a real database?
If you can afford it (if your users can pay the download cost/time), then know that SQLite is available as a WASM build, and can run in the browser.
It's backed by the Origin Private File System API (OPFS), which has been available in all browsers for 1,5 year (Firefox 111 was the last one to support).
Check it out https://sqlite.org/wasm/doc/trunk/index.md
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@patrickbrosset another option is to use the built in storage options of the browser.
@barefootstache yes of course. SQLite actually does use browser-provided storage (OPFS), but offers you a SQL layer on top of it, which many people find appealing.