@inconcept-labs/fallback-storage

Some browsers don't support specific types of storages (localStorage, sessionStorage, etc.) or they may be disabled from browser settings. This library, lets you specify a fallback order, and it will check which storage type is available from the list, and use it.

For example, if you specify ['localStorage', 'sessionStorage', 'cookieStorage', 'memoryStorage'], it will use localStorage if it is supported, otherwise it will try the next one and so on.

For avoiding item key collisions, you can also specify which prefix you want for the storage name.

Installation

Using npm:

$ npm i @inconcept-labs/fallback-storage

Using yarn:

$ yarn add @inconcept-labs/fallback-storage

Usage

import StorageFallback from '@inconcept-labs/fallback-storage';

const prefix = 'cs';
export const cookieStorage = new StorageFallback(prefix, [
  'cookieStorage',
  'memoryStorage',
]);

cookieStorage.setItem('cookie_key', 'cookie_value');
cookieStorage.getItem('cookie_key');
cookieStorage.removeItem('cookie_key');
cookieStorage.removeItem('cookie_key');
cookieStorage.hasItem('cookie_key');
cookieStorage.clear();

Documentation

Types

StorageType = 'localStorage' | 'sessionStorage' | 'cookieStorage' | 'memoryStorage'

Constructor

StorageFallback(storageOrders, prefix)

Create a storage that stores items with prefix prepended and fallback order of storageOrders.

 Parameters

  storageOrders: StorageType[]
  prefix: string

 Return values

  StorageFallback

Instance methods

setItem

Store an item by key

 Parameters

  key: string
  value: string

 Return values

  None

getItem

Retrieve an item by key

 Parameters

  key: string

 Return values

  string | null

removeItem

Remove an item by key

 Parameters

  key: string

 Return values

  None

hasItem

Determine if the key is present in the storage

 Parameters

  key: string

 Return values

  boolean

clear

Remove all items from the storage

 Parameters

  None

 Return values

  None

Gotchas

• CookieStorage has storage capacity limitations. Also, if browser is closed cookies will be removed.
• MemoryStorage does not persist between page loads. This is more or less a stop-gap to prevent page crashes, but may be sufficient for websites that don't do full page reloads.
• Using browser native storage clear functions will remove your storage data.

Thanks

local-storage-fallback for inspiration

License

MIT