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");

 

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");

 

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