![]() ![]() While it may be uncommon for users to modify their locally stored data, it's quite common for users to clear it. Unlike server-side databases where you can restrict unauthorized access, client-side databases are accessible to browser extensions and developer tools, and they can be cleared by the user. function arrayBufferToBlob ( buffer, type ) Stored data may have been modified or deleted by the user # To convert an ArrayBuffer to a Blob you simply use the Blob constructor. You will need to store the type alongside the buffer in order to do the conversion correctly. Remember, however, that a Blob has a MIME type while an ArrayBuffer does not. Storing ArrayBuffers in IndexedDB is very well supported. Luckily it is not too difficult to convert a Blob into an ArrayBuffer, and vice versa. Safari on iOS, in particular, cannot store Blobs in IndexedDB. This will work on some platforms but fail on others. If you are storing large, user-generated files such as images or videos, then you may try to store them as File or Blob objects. Not everything can be stored in IndexedDB on all platforms # This section explores many of the issues you must keep in mind when working with IndexedDB. Keeping your app predictable #Ī lot of the complexities around IndexedDB stem from the fact that there are so many factors you (the developer) have no control over. This article answers common questions and discusses some of the most important things to keep in mind when persisting data in IndexedDB. However, when using IndexedDB there are many important things to consider that may not be immediately obvious to developers new to the APIs. The app can then sync up with any API services in the background and update the UI with new data lazily, employing a stale-while- revalidate strategy.Īnother good use for IndexedDB is to store user-generated content, either as a temporary store before it is uploaded to the server or as a client-side cache of remote data - or, of course, both. Storing the application state in IndexedDB can be a great way to speed up the load time for repeat visits. For example, sometimes the app needs to authenticate the user client-side and then make several API requests before it has all the data it needs to display on the page. ![]() When a user first loads a website or application, there's often a fair amount of work involved in constructing the initial application state that's used to render the UI. Stored data may have been modified or deleted by the user.Not everything can be stored in IndexedDB on all platforms. ![]()
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