Скачать или смотреть How to Fix Redux-Persist Not Storing State in Local Storage

Learn how to properly configure `Redux-Persist` to ensure your state, especially user data, is persisted across browser sessions.
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How to Fix Redux-Persist Not Storing State in Local Storage

Introduction

Are you facing an issue with Redux-Persist where your state isn’t being stored in local storage after refreshing your browser? This is a common problem when trying to persist specific reducer states to ensure that user data doesn’t disappear unexpectedly. In this guide, we’ll identify the root cause of the issue and provide practical solutions to ensure your Redux state persists as intended.

The Issue

When using Redux-Persist to save specific reducer states, you might notice that the expected data, such as user information, isn’t present in local storage after a browser refresh. Instead, you see entries like:

[[See Video to Reveal this Text or Code Snippet]]

This indicates that there's a configuration issue in how persistence is set up.

Why Is This Happening?

The main reason behind the missing user data in local storage lies within the persistence configuration. The whitelist you defined only persists certain keys. However, the user reducer may not have its data structure correctly set up to allow this.

Here’s a brief look at the code causing the issue:

[[See Video to Reveal this Text or Code Snippet]]

However, the user slice’s reducer by itself doesn't contain a user key. Instead, it's just the user.reducer function.

Solutions to Fix the Issue

Solution 1: Persisting the Entire user.reducer

One straightforward solution is to persist the entire user.reducer without using the whitelist. Here is a modified code snippet:

[[See Video to Reveal this Text or Code Snippet]]

With this configuration, the entire state of our user slice will now be stored in local storage, ensuring that it survives page refreshes.

Solution 2: Create a Root Reducer with combineReducers

If you want to maintain specific whitelisting, you can create a root reducer that combines reducers and then whitelist the user state:

[[See Video to Reveal this Text or Code Snippet]]

This method allows you to control which parts of your state you want to persist while still maintaining your reducer structure.

Conclusion

Persisting your Redux state can be tricky, but understanding how to properly configure Redux-Persist can make all the difference. Whether you choose to persist the entire reducer or combine your reducers into a root reducer, ensuring that your user data is saved will prevent it from disappearing after a browser refresh. Follow these approaches, and you can keep your application’s user state intact and functioning smoothly.

Feel free to share your experiences or any other challenges you might have faced while working with Redux-Persist in the comments below!