Error: The quota has been exceeded. on Safari IOS 10

Question

I'm getting this error on my iPhone's safari, when doing localStorage.setItem('user',some string here):

Error: The quota has been exceeded.
setItem@[native code]

It is not private mode! What other circumstances can make localStorage not work?

Answer 1

I created this class to help get around private browsing. However, storage will be blown away when you refresh the browser.

const data = {};
let hasLocalStorage = false;

if (localStorage) {
  try {
    const x = 'storageTest';
    localStorage.setItem(x, x);
    localStorage.removeItem(x);
    hasLocalStorage = true;
  } catch (e) {
    hasLocalStorage = false;
  }
}

class StorageUtilities {
  setItem(key, value) {
    if (hasLocalStorage) {
      localStorage.setItem(key, value);
    } else {
      data[key] = value;
    }
  }

  getItem(key) {
    if (hasLocalStorage) {
      return localStorage.getItem(key);
    }
    return data[key];
  }

  removeItem(key) {
    if (hasLocalStorage) {
      localStorage.removeItem(key);
    } else {
      data[key] = null;
    }
  }
}

const storageUtilities = new StorageUtilities();

export default storageUtilities;

Answer 2

Actually it was Private mode. Looks like it is enabled by default on new iphones.