Redux persistent storage encryption example.

store.js

import { combineReducers, createStore, applyMiddleware } from 'redux';
import storage from 'redux-persist/lib/storage';
import { persistReducer, persistStore } from 'redux-persist';
import promise from 'redux-promise';
import createEncryptor from 'redux-persist-transform-encrypt'; // <----- Import createEncryptor

const rootReducer = combineReducers({
  myPersistentData: dataReducer,
  someMorePresistentData: randomReducer,
});

/*
 Configure your encryptor with the secret key
 NOTE: This secret key is required for access to data.
 If the key is incorrect or changed after storing data
 with some different key, it will return null.
*/
const encryptor = createEncryptor({
  secretKey: 'my-not-so-secret-encryption-key',
  onError: (error) => {
    console.warn('error occured on encryptor', error);
  },
});

const config = {
  key: '_myPersistentDataKey',
  storage,
  /* Add the encryptor as a transform property. This is will
  tell the persistent storage to encrypt data using the
  configuration given earlier,i.e., our secretKey. */
  transforms: [encryptor],  // <----- Add this line.
};

const reducer = persistReducer(config, rootReducer);

const store = createStore(
  reducer,
  {},
  applyMiddleware(promise),
);
const persist = persistStore(store);

export default { store, persist };