How to Reset the Redux Store State on User Logout?

Resetting the Redux Store State for User Session Management

Redux provides a robust framework for state management in applications. To ensure data integrity, it may be necessary to reset the store to its initial state when a user logs out. This prevents data associated with the previous user from being cached and potentially affecting the experience of the next user.

Custom Root Reducer

One approach to reset the store is to create a custom root reducer that delegates handling to individual reducers. However, it overrides the default behavior for the USER_LOGOUT action and returns the initial state.

const appReducer = combineReducers({
  /* your app’s top-level reducers */
})

const rootReducer = (state, action) => {
  if (action.type === 'USER_LOGOUT') {
    return appReducer(undefined, action)
  }

  return appReducer(state, action)
}

Storage Cleanup with Redux-Persist

If using redux-persist, additional steps are required to clear the cached state from storage. This involves import the appropriate storage engine and parsing the state before setting it to undefined, then clearing each storage state key.

const rootReducer = (state, action) => {
    if (action.type === SIGNOUT_REQUEST) {
        // for all keys defined in your persistConfig(s)
        storage.removeItem('persist:root')
        // storage.removeItem('persist:otherKey')

        return appReducer(undefined, action);
    }
    return appReducer(state, action);
};

By implementing these strategies, you can effectively reset the Redux store to its initial state when a user logs out, ensuring data integrity and a seamless user experience for subsequent users.

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