What is localStorage?
How to use localStorage
To use localStorage, you first need to get a reference to the
localStorage object. You can do this using the
Set data to localStorage
Once you have a reference to the
localStorage object, you can use the
setItem() method to store data. The
setItem() method takes two arguments: the
key and the
value. The key is a string that identifies the data, and the value is the data itself. For example, the following code would store the value “12345” in the key “myNumber”:
Get data from localStorage
To retrieve data from localStorage, you can use the
getItem() method. The
getItem() method takes one argument: the key. The method returns the
value associated with the
null if the key does not exist. For example, the following code would get the value of the key “myNumber”:
var myNumber = window.localStorage.getItem(“myNumber”);
Remove data from localStorage
You can also use the
removeItem() method to delete data from
removeItem() method takes one argument: the
key. For example, the following code would delete the key “myNumber”:
Limitations of localStorage
localStorage has a few limitations that you should be aware of.
- The total amount of data that can be stored in localStorage is limited to 5MB.
localStorageis not persistent across different browsers. If a user uses a different browser to visit your website, the data that is stored in localStorage in one browser will not be available in the other browser.
When to use localStorage
localStorage is a good choice for storing data that needs to be persisted between page loads, but it is not a good choice for storing sensitive data. If you need to store sensitive data, you should use a more secure storage mechanism, such as a database.
Here are some examples of when you might want to use localStorage:
- Storing user preferences, such as the preferred language or the font size
- Storing the contents of a shopping cart
- Storing the progress of a game
localStorage is a powerful tool that can be used to store data in the user’s browser. However, it is important to be aware of the limitations of localStorage before you use it.