The difference between add and put is same as in any API. If you try to insert an element with key that already exist using the put function it will trigger and update of the existing element, however if you use the add function and element with same id exist you will get an error … Read more
It’s like localStorage, so it’s cross-session, meaning restarting browser or system won’t affect what is stored in it. However, user can clear it like clearing cookie. So it’s just like persistent cookie, you don’t trust it from the server-side, and you always need to check its integrity.
Web SQL is deprecated per https://www.w3.org/TR/webdatabase/. You can use IndexedDB if you need to store structured client specific data that you do not store in the server side or you do not want to request from the server every time. Also as opposed to localStorage, IndexedDB is async so it is more performant. It supports … Read more
Update May 2020: Chrome now lets an origin use 60% of the storage device’s space (Real nitty gritty: “storage device” is the partition containing the chrome profile directory). Updated article here https://web.dev/storage-for-the-web/#how-much The rule of thumb is 6% (edit 2015-Jul: was 10%) of the available space on the user’s hard drive, less if your origin … Read more
I wrote the db.js library so I might be a bit biased but it’s main goals were to: Add Promise based callback handling rather than wiring up events to onsuccess and the like Add a simple and fluent API for querying that relied on method chaining and ultimately looked like JavaScript code Use a JavaScript … Read more