Redux Persist is a popular library that enables Redux applications to persist the state of the store in storage such as the browser’s local storage or a server-side database. This can be useful in a variety of situations, such as preserving the state of the store across page reloads or preserving the state of the store between sessions. In this blog, we’ll look at how to use Redux Persist to add state persistence to a Redux application.
To start, you’ll need to install the redux-persist library, which provides the functions and middlewares you’ll need to add state persistence to your Redux app. You can install it using npm or yarn:
npm install redux-persist
or
yarn add redux-persist
Once you’ve installed the library, you’ll need to configure it by creating a persistStore instance and passing it to the PersistGate component, which should wrap your entire app. You’ll also need to specify the storage engine that you want to use, such as localStorage or AsyncStorage.
Here’s an example of how to configure redux-persist and use it to persist the state of a Redux store:
import { persistStore } from 'redux-persist';
import { PersistGate } from 'redux-persist/integration/react';
// Create the persistor instance
const persistor = persistStore(store);
ReactDOM.render(
<Provider store={store}>
<PersistGate persistor={persistor}>
<App />
</PersistGate>
</Provider>,
document.getElementById('root')
);
In the example above, the PersistGate component is used to wrap the entire app, and the persistor instance is passed to it as a prop. The persistor instance is responsible for managing the persistence of the store’s state.
To specify which pieces of the store’s state should be persisted, you’ll need to create a persistConfig object and pass it to the persistStore function. The persistConfig object should contain a blacklist or whitelist property, which specifies which reducers should be persisted.
Here’s an example of how to create a persistConfig object and pass it to the persistStore function:
import { persistStore } from 'redux-persist';
const persistConfig = {
whitelist: ['auth']
};
const persistor = persistStore(store, persistConfig);
In the example above, only the state managed by the auth reducer will be persisted.
That’s a basic overview of how to use redux-persist to add state persistence to a Redux application. There are many more advanced features available, such as the ability to customize the storage engine, specify custom serialization and deserialization functions, and use versioning to migrate the persisted state between versions of the app. You can read more about these features in the redux-persist documentation.
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