How to Manage Data Expiration in HTML5 Local Storage?

Storing Data Expiration in HTML5 Local Storage

Data stored in HTML5's Local Storage component (part of DOM Storage) persists indefinitely until explicitly cleared or overwritten. However, the ability to set an expiration time for cached data is not natively provided.

Solution to Managing Expiration

One approach is to store a timestamp alongside the data itself. For instance:

<code class="javascript">var object = { value: "value", timestamp: new Date().getTime() };
localStorage.setItem("key", JSON.stringify(object));</code>

Upon retrieval, you can parse the stored object, extract the timestamp, and compare it to the current time. If the expiration period has passed, you can update the data accordingly.

<code class="javascript">var object = JSON.parse(localStorage.getItem("key"));
var dateString = object.timestamp;
var now = new Date().getTime().toString();

compareTime(dateString, now); // Implementation required</code>

Alternatively, you can use a third-party library such as localstorage-slim.js, which provides an API for setting expiration times for Local Storage data.

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