HTML Web Storage

HTML Web Storage, also known as Web Storage API or DOM Storage, provides a way for web applications to store data locally within the user’s browser. It offers two mechanisms: sessionStorage and localStorage, both of which provide key-value storage. Here’s an overview of HTML Web Storage:

sessionStorage:

• sessionStorage allows you to store data that is accessible only within the same browser session or tab.
• Data stored in sessionStorage remains available as long as the browser window or tab is open.
• To store data in sessionStorage, use the sessionStorage.setItem(key, value) method.
• Example:
  

sessionStorage.setItem('username', 'John');

localStorage:

• localStorage allows you to store data that persists even after the browser is closed and reopened.
• Data stored in localStorage is available across browser sessions and tabs.
• To store data in localStorage, use the localStorage.setItem(key, value) method.
• Example:

localStorage.setItem('theme', 'dark');

Retrieving Data:

• To retrieve data from Web Storage, use the getItem(key) method, specifying the key for the desired value.
• Example:

const username = sessionStorage.getItem('username');
const theme = localStorage.getItem('theme');

Updating and Removing Data:

• You can update the value of a stored item by using the setItem(key, value) method with an existing key.
• Example:

sessionStorage.setItem('username', 'Jane'); // Update the value of 'username' in sessionStorage

• To remove a specific item from Web Storage, use the removeItem(key) method, passing the key of the item to be removed.
• Example:

localStorage.removeItem('theme'); // Remove the 'theme' item from localStorage

• Alternatively, you can clear all stored data in sessionStorage or localStorage using the clear() method.
• Example:

sessionStorage.clear(); // Clear all data stored in sessionStorage

Limitations:

• Web Storage has a limit on the amount of data that can be stored, typically several megabytes per domain.
• Data stored in Web Storage is accessible only to the specific domain that set it.
• Web Storage is synchronous, meaning that it can block the main thread during read and write operations. Be mindful of performance implications.

HTML Web Storage is a convenient way to store and retrieve data on the client-side, allowing web applications to maintain state, cache data, and provide a better user experience. It is widely supported by modern browsers and provides a simple and efficient means of persisting data within a user’s browser environment.