QuotaExceededError Dom exception 22 An attempt was made to add something to storage that exceeded the quota

Question

Using LocalStorage on iPhone with iOS 7 throws this error  I ve been looking around for a resolvant  but considering I m not even browsing in private  nothing is relevant   I don t understand why localStorage would be disabled by default in iOS 7  but it seems it is  I ve tested on other websites as well  but with no luck  I even tried testing it using this website  http   arty name localstorage html  but it doesn t seem like it s saving anything at all for some weird reason   Has anyone had the same problem  only they ve had luck fixing it  Should I switch my storage method   I tried hard-debugging it by only storing a few lines of information  but to no avail  I used the standard localStorage setItem   function to save

User · Answer

I happened to run with the same issue in iOS 7 (with some devices no simulators).

Looks like Safari in iOS 7 has a lower storage quota, which apparently is reached by having a long history log.

I guess the best practice will be to catch the exception.

The Modernizr project has an easy patch, you should try something similar: https://github.com/Modernizr/Modernizr/blob/master/feature-detects/storage/localstorage.js

User · Answer

I use this simple function  which returns true or false  to test for localStorage availablity   isLocalStorageNameSupported   function         var testKey    test   storage   window sessionStorage      try           storage setItem testKey   1            storage removeItem testKey           return true        catch  error            return false            Now you can test for localStorage setItem   availability before using it  Example   if   isLocalStorageNameSupported              can use localStorage setItem  item   value     else          can t use localStorage setItem  item   value

User · Answer

This can occur when Safari is in private mode browsing  While in private browsing  local storage is not available at all   One solution is to warn the user that the app needs non-private mode to work   UPDATE  This has been fixed in Safari 11  so the behaviour is now aligned with other browsers

User · Answer

As already explained in other answers  when in Private Browsing mode Safari will always throw this exception when trying to save data with localStorage setItem       To fix this I wrote a fake localStorage that mimics localStorage  both methods and events    Fake localStorage  https   gist github com engelfrost fd707819658f72b42f55  This is probably not a good general solution to the problem  This was a good solution for my scenario  where the alternative would be major re-writes to an already existing application

User · Answer

In April 2017 a patch was merged into Safari  so it aligned with the other browsers  This was released with Safari 11   https   bugs webkit org show bug cgi id 157010

User · Answer

This question and answer helped me solve a specific problem with signing up new users in Parse    Because the signUp  attrs  options   function uses local storage to persist the session  if a user is in private browsing mode it throws the  QuotaExceededError  DOM Exception 22  An attempt was made to add something to storage that exceeded the quota   exception and the success error functions are never called    In my case  because the error function is never called it initially appeared to be an issue with firing the click event on the submit or the redirect defined on success of sign up   Including a warning for users resolved the issue   Parse Javascript SDK Reference https   parse com docs js api classes Parse User html methods signUp     Signs up a new user with a username  or email  and password  This will create a new Parse User on the server  and also persist the session in localStorage so that you can access the user using   link  current

User · Answer

Update  2016-11-01   I was using AmplifyJS mentioned below to work around this issue  However  for Safari in Private browsing  it was falling back to a memory-based storage  In my case  it was not appropriate because it means the storage is cleared on refresh  even if the user is still in private browsing   Also  I have noticed a number of users who are always browsing in Private mode on iOS Safari  For that reason  a better fallback for Safari is to use cookies  if available   By default  cookies are still accessible even in private browsing  Of course  they are cleared when exiting the private browsing  but they are not cleared on refresh   I found the local-storage-fallback library  From the documentation      Purpose      With browser settings like  Private Browsing  it has become a problem to rely on a working window localStorage  even in newer browsers  Even though it may exist  it will throw exceptions when trying to use setItem or getItem  This module will run appropriate checks to see what browser storage mechanism might be available  and then expose it  It uses the same API as localStorage so it should work as a drop-in replacement in most cases    Beware of the gotchas         CookieStorage has storage limits  Be careful here    MemoryStorage will 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 loads       TL DR   Use local-storage-fallback  unified API with  getItem prop  and  setItem prop  val        Check and use appropriate storage adapter for browser  localStorage  sessionStorage  cookies  memory    Original answer  To add upon previous answers  one possible workaround would be to change the storage method  There are a few librairies such as AmplifyJS and PersistJS which can help  Both libs allow persistent client-side storage through several backends   For AmplifyJS     localStorage         IE 8    Firefox 3 5    Safari 4    Chrome   Opera 10 5    iPhone 2    Android 2          sessionStorage         IE 8    Firefox 2    Safari 4    Chrome   Opera 10 5    iPhone 2    Android 2          globalStorage         Firefox 2          userData         IE 5 - 7   userData exists in newer versions of IE as well  but due to quirks in IE 9 s implementation  we don t register userData if localStorage   is supported          memory         An in-memory store is provided as a fallback if none of the other storage types are available       For PersistentJS        flash  Flash 8 persistent storage    gears  Google Gears-based persistent storage    localstorage  HTML5 draft storage    globalstorage  HTML5 draft storage  old spec     ie  Internet Explorer userdata behaviors    cookie  Cookie-based persistent storage       They offer an abstraction layer so you don t have to worry about choosing the storage type  Keep in mind there might be some limitations  such as size limits  depending on the storage type though  Right now  I am using AmplifyJS  but I still have to do some more testing on iOS 7 Safari etc  to see if it actually solves the problem

User · Answer

As mentioned in other answers  you ll always get the QuotaExceededError in Safari Private Browser Mode on both iOS and OS X when localStorage setItem  or sessionStorage setItem  is called   One solution is to do a try catch or Modernizr check in each instance of using setItem   However if you want a shim that simply globally stops this error being thrown  to prevent the rest of your JavaScript from breaking  you can use this   https   gist github com philfreo 68ea3cd980d72383c951     Safari  in Private Browsing Mode  looks like it supports localStorage but all calls to setItem    throw QuotaExceededError  We re going to detect this and just silently drop any calls to setItem    to avoid the entire page breaking  without having to do a check at each usage of Storage  if  typeof localStorage      object         try           localStorage setItem  localStorage   1           localStorage removeItem  localStorage          catch  e            Storage prototype  setItem   Storage prototype setItem          Storage prototype setItem   function               alert  Your web browser does not support storing settings locally  In Safari  the most common cause of this is using  Private Browsing Mode   Some settings may not save or some features may not work properly for you

User · Answer

Here is an expanded solution based on DrewT s answer above that uses cookies if localStorage is not available  It uses Mozilla s docCookies library   function localStorageGet  pKey         if  localStorageSupported               return localStorage pKey         else           return docCookies getItem   localstorage   pKey             function localStorageSet  pKey  pValue         if  localStorageSupported               localStorage pKey    pValue        else           docCookies setItem   localstorage   pKey  pValue                global to cache value var gStorageSupported   undefined  function localStorageSupported         var testKey    test   storage   window sessionStorage      if  gStorageSupported     undefined             try               storage setItem testKey   1                storage removeItem testKey               gStorageSupported   true            catch  error                gStorageSupported   false                      return gStorageSupported      In your source  just use   localStorageSet   foobar    yes         var foo   localStorageGet   foobar

[javascript] QuotaExceededError: Dom exception 22: An attempt was made to add something to storage that exceeded the quota

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