Instant HTML5 Local Storage How-to

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Introduction to HTML5 Web Storage

Remembering User Data One reason to use localStorage is to remember user data. While we still want to remember most user data on the server, there are some cases where you might want to store data on the client instead: If you want to build an app without a server maybe for prototyping , If you want to give users a customized experience before forcing them to create an account, or If you're building an app that inherently lives only in a client like browser extensions or mobile apps.

Example: dillinger.

How to use Local Storage in JavaScript

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HTML 5 Web Storage HTML

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Web Storage API

Please read our commenting policy. In the above example we have saved a simple string into local storage. Thinking back to our splash page example, a good way to show a splash page without being annoying is by setting a time limit in our local storage tracker. As you can see above, we have the date that the user visited the site saved into local storage. Now we need to set up a way of checking to see how long it has been since the user last visited.

When a user hits the page, the script checks to see the last time the user visited the site. This is done with localStorage.

Instant Html5 Local Storage How-To

That date is subtracted from the current date and the difference is compared to the length of a week. Then the splash page is either hidden or shown to the user depending on if the date difference is greater than a week. By default local storage just saves key pair string values, so how can you save an object? If you were to save an object directly to local storage it would try to save it as a string.

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Luckily, JSON. Before we start the discussion of local storage, I want to give you an overview of the available disk space in major mobile and desktop browsers. When using local storage, your data will stay on the client and persist across sessions and device restarts.

As I mentioned in the introduction, the limit of the local storage API is tied to the specific browser as shown in the previous tables , protocol, port, and top level domain in use. It gets flushed frequently, sometimes even within the same visit.

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There has been a lot of discussion about local storage performance. Local storage can have a performance hit if not used carefully.

Introduction to HTML5 Web Storage | Overview

Local storage writes and reads data from the hard drive, which can be a much more expensive operation than reading from memory. This performance hit is not a major issue with small amounts of data, but it can be noticeable using the full storage limit. As a good practice you should try to perform as few reads as possible.

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Also, because we are dealing with a synchronous API, you should try to read data from local storage only after the window. But things are getting better. An article published by Peter McLachlan of Mobify explained that local storage can be 5x faster than native cache on mobile devices. You can also see that local storage has always been faster than native cache.