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Web Storage API

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The Web Storage API is a simple syntax for storing and retrieving data in the browser. It is very easy to use:

 

localStorage.setItem("name", "John Doe");
localStorage.getItem("name");

The Web Storage API is supported in all browsers:

Chrome Internet explorer Mozila Firefox Safari Opera
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(keynamevalue) Adds that key to the storage, or update that key’s 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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