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Learn how to selectively store data in local storage with Redux Persist by using a filter transformator to enhance your React app's user experience.
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How to Persist a Subset of Redux Store in Local Storage Using Redux Persist

When building modern web applications, ensuring a smooth user experience is paramount. One common approach to improving UX is to persist certain pieces of state between page refreshes. Redux Persist is a powerful tool for managing this in Redux-based applications. However, what if you only want to save specific parts of your Redux state? In this guide, we will explore how to achieve this by using the redux-persist-transform-filter package.

Understanding the Problem

In many applications, especially those involving user authentication and data entry, not all state information should persist across refreshes. For example, consider our two reducers: userSignup and userLogin.

UserSignupReducer contains loading states and potential error messages that are better left unreturned to the user after a refresh.

UserLoginReducer maintains an isLoggedIn status, which is crucial for determining user authentication across sessions.

The goal is to persist only certain fields from these reducers — specifically:

From userSignup, persist only the userData.

From userLogin, persist only the isLoggedIn status.

Solution Overview: Using a Filter Transformator

To address the requirement of selectively persisting parts of the Redux state, we will leverage a filter transformator called redux-persist-transform-filter. Here's how we can implement it step by step:

Step 1: Install the Package

First, you need to install the redux-persist-transform-filter package in your project. Run the command:

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Step 2: Modify the Root Reducer

In your main reducer file (rootReducer.js), you will configure the necessary transformations to persist only the desired subsets. Below are the modifications you need to make:

Import the Filter Creator

At the beginning of your rootReducer.js, import the filter creator:

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Create Filters for Your Reducers

Next, create filters for your reducers, specifying the state fields to persist:

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Update the Persist Configuration

Finally, incorporate these filters into your persistConfig as follows:

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Your complete rootReducer.js might look something like this:

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Conclusion

By following these steps, you can effectively persist a subset of your Redux store in local storage, enhancing the user experience by preventing unintended state retention across page refreshes. This targeted persistence allows for a cleaner application state and a more intuitive user interface.

If you have any questions about implementing this strategy in your application, feel free to leave a comment below!