What Is Local Storage


Local storage is a web storage type that enables JavaScript sites and apps to store data (key-value pairs) in the browser with no expiration date. So, unlike session storage, local storage holds the data even when the tab or browser is closed.

Compared to cookies, local storage offers a higher storage limit (around 5 MB or more), the syntax is straightforward, and it does not send data to the server during an HTTP request.

Use Cases and Examples

Local Storage is used mostly when a website wants to hold data that a user might want to see in the next visit. For example, shopping cart, UI theme, etc.

To store values in localStorage, setItem() method is used. For example, window.localStorage.setItem('key', 'value');. Similarly, there are other methods for carry out other functions with localStorage, such as getItem(), remoteItem(), clear(), etc.


It is not meant to store sensitive data. Third-party (code on the website can easily access the data and this might lead to a security breach. The key advantage of local storage is that there is no expiration date, so the data is retained for as long as the developer wants.

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