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# JavaScript Storage Objects The Web Storage API provides two storage objects, `sessionStorage` and `localStorage`, to add, delete, modify, and query data for web pages. * `localStorage` is used to store data for the entire website permanently. The stored data has no expiration time until it is manually removed. * `sessionStorage` is used to temporarily store data for the same window (or tab). The data will be deleted after closing the window or tab. ### Storage Object Properties | Property | Description | | --- | --- | | length | Returns the number of data entries in the storage object. | ### Storage Object Methods | Method | Description | | --- | --- | | key(_n_) | Returns the name of the _n_th key in the storage object. | | getItem(_keyname_) | Returns the value of the specified key. | | setItem(_keyname_, _value_) | Adds a key and value. If the corresponding value exists, it updates the value for that key. | | removeItem(_keyname_) | Removes the key. | | clear() | Clears all keys in the storage object. | ### Web Storage API | Property | Description | | --- | --- | | [window.localStorage](#) | Stores key/value pairs in the browser. No expiration time. | | [window.sessionStorage](#) | Stores key/value pairs in the browser. The data will be deleted after closing the window or tab. |