Web Storage API

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Web Storage API


The Web Storage API is 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");

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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 Web Site.
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 a 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 parameter:

Example

localStorage.getItem("name");









The sessionStorage Object
The sessionStorage object is identical to the localStorage object.
The difference is that the sessionStorage object stores data for one session.
The data is deleted when the browser is closed.

Example

sessionStorage.getItem("name");

Try it Yourself »


The setItem() Method
The sessionStorage.setItem() method stores a data item in a 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 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 that key from the storage


clear()
Empty all key out of the storage


Related Pages for Web Storage API


Property
Description


window.localStorage
Allows to save key/value pairs in a web browser. Stores the data with no
expiration date


window.sessionStorage
Allows to save key/value pairs in a web browser. Stores the data for one
session














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Reference: https://www.w3schools.com/js/js_api_web_storage.asp