Persist Redux State
What does Persist Redux state mean?
One common challenge in React applications is rehydrating the Redux state after a page reload or between user sessions. A typical workaround is to re-fetch the data via an API call and store it in the Redux state. However, you can now rehydrate the Redux state without additional API calls using a technique called Persisted Redux State.
The redux-persist package
This package and the typical redux packages @reduxjs/toolkit and react-redux can be used to create a redux state that can persist across the page reload or user session in the browser.
Prerequisites
- You have a running react application.
Installations
Use this command to install all the necessary packages to set up a persisting redux state.
npm i --save @reduxjs/toolkit react-redux redux-persist
Setting up a Persisting Redux State
1.Configure your redux store [store.js].
import { combineReducers, configureStore } from "@reduxjs/toolkit";
import sampleSlice from "./sampleSlice";
import storageSession from "redux-persist/lib/storage/session"; // session storage
import { FLUSH, PAUSE, PERSIST, persistReducer, persistStore, PURGE, REGISTER, REHYDRATE } from 'redux-persist';
const rootReducer = combineReducers({
sample : sampleSlice.reducer;
})
const persistConfig = {
key:'root',
storage: storageSession,
}
const persistedReducer = persistReducer(persistConfig, rootReducer)
const store = configureStore({
reducer: persistedReducer,
middleware: (getDefaultMiddleware) =>
getDefaultMiddleware({
serializableCheck: {
ignoredActions: [FLUSH, REHYDRATE, PAUSE, PERSIST, PURGE, REGISTER],
},
})
})
const persister = persistStore(store);
export default store
NOTE: If you want your redux to persist not only between the reloads but also between the user-sessions in the browser replace the
import storageSession from "redux-persist/lib/storage/session"; // session storage
import with
import storageSession from "redux-persist/lib/storage"; // local storage
2.Wrap your Root Component [index.js].
import React from 'react';
import ReactDOM from 'react-dom/client';
import './index.css';
import { BrowserRouter } from 'react-router-dom';
import store, { persistor } from './store';
import { Provider } from 'react-redux';
import { PersistGate } from 'redux-persist/integration/react';
import App from './App';
const root = ReactDOM.createRoot(document.getElementById('root') as HTMLElement);
root.render(<BrowserRouter>
<Provider store={store}>
<PersistGate loading={null} persistor={persistor}>
<App />
</PersistGate>
</Provider>
</BrowserRouter>);
and done! your persisting redux state is ready.
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