Web Storage API
The Web Storage API provides a simple syntax for storing and retrieving data in the browser. It is very easy to use:
Example:
localStorage.setItem("name", "John Doe");localStorage.getItem("name");
The Web Storage API is supported in all browsers:
Chrome
IE/Edge
Firefox
Safari
Opera
Yes
Yes
Yes
Yes
Yes
The localStorage Object
The localStorage object provides access to a local storage for a particular website. It allows you to store, read, add, modify, and delete data items for that domain. The data is stored with no expiration date and will not be deleted when the browser is closed. The data will be available for days, weeks, and years.
The setItem() Method
The localStorage.setItem() method stores a data item in storage. It takes a name and a value as parameters:
Example:
localStorage.setItem("name", "John Doe");
The getItem() Method
The localStorage.getItem() method retrieves a data item from the storage. It takes a name as a parameter:
Example:
localStorage.getItem("name");
The sessionStorage Object
The sessionStorage object is identical to the localStorage object, but with one difference: it stores data for one session. The data is deleted when the browser is closed.
Example:
sessionStorage.getItem("name");
The setItem() Method
The sessionStorage.setItem() method stores a data item in storage. It takes a name and a value as parameters:
Example:
sessionStorage.setItem("name", "John Doe");
The getItem() Method
The sessionStorage.getItem() method retrieves a data item from the storage. It takes a name as a parameter:
Example:
sessionStorage.getItem("name");
Storage Object Properties and Methods
Property/Method
Description
key(n)
Returns the name of the nth key in the storage
length
Returns the number of data items stored in the storage object
getItem(keyname)
Returns the value of the specified key name
setItem(keyname, value)
Adds a key to the storage, or updates a key value if it already exists
removeItem(keyname)
Removes the specified key from the storage
clear()
Empties all keys from the storage
Related Pages for Web Storage API
Property
Description
window.localStorage
Allows saving key/value pairs in a web browser. Stores the data with no expiration date
window.sessionStorage
Allows saving key/value pairs in a web browser. Stores the data for one session
These methods and properties make it easy to manage data in the browser, whether you need to store it permanently or just for a single session.
