How to Properly Reset a Redux Store State Upon User Logout?

Resetting Redux Store State on User Logout

In Redux, the store maintains the application's state. Ensuring that the store is reset to its initial state when a user logs out is essential to prevent caching issues and data contamination.

To accomplish this, one approach involves creating a custom root reducer. It will delegate action handling to reducers generated by combineReducers(). However, when it encounters a USER_LOGOUT action, it will return the initial state.

Assuming you have a rootReducer that looks like this:

const rootReducer = combineReducers({
  // Your app's top-level reducers
});

You can rename it to appReducer and define a new rootReducer that delegates to appReducer:

const appReducer = combineReducers({
  // Your app's top-level reducers
});

const rootReducer = (state, action) => {
  return appReducer(state, action);
};

Next, teach the rootReducer to return the initial state when the USER_LOGOUT action is received. Reducers are known to return the initial state when called with undefined as the first argument, regardless of the action type. We can leverage this behavior:

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

  return appReducer(state, action);
};

With this modification, all reducers will be re-initialized upon USER_LOGOUT, and they can optionally return different states based on the action.type.

If your application uses redux-persist, you may need to clear the stored state as well:

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

    return appReducer(undefined, action);
  }

  return appReducer(state, action);
};

This approach ensures that both the in-memory Redux store and the stored state are reset when the user logs out, maintaining a clean state for subsequent user sessions.

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