AsyncStorage with redux store

Question

I am using Redux to manage the cart state but on restarting the app, the cart state becomes empty. To resolve, I thought of using AsyncStorage to store the data and get it in componentDidMount but it shows null instead of the cart data.

REDUX ACTION CODE

case 'ADD_TO_CART':
       {
           const updatedCart = [...state.cart];
           const item = updatedCart.find(x=>x.key===action.payload.key);
           if(item)
           {
            item.count++;
           }
           else{
             updatedCart.push(action.payload);
           }
           AsyncStorage.setItem('cart',{...state,cart: updatedCart,total: state.total + 1})
            return {
                ...state,
                cart: updatedCart,
                total: state.total + 1,
               
            }
       }

FETCHING DATA

async componentDidMount() {
     const item = await AsyncStorage.getItem('cart'))
     console.log(item)
  }

I have one more action to delete the cart item in which the same setItem method is used to set the cart state.

Answer 1

When you set an Object to Async storage it should be a string not an object, so use a JSON.strigify and set the item like below

AsyncStorage.setItem('cart',JSON.stringify({...state,cart: updatedCart,total: state.total + 1}));

When you get the item use JSON.parse() to parse them item like below

   const item = await AsyncStorage.getItem('cart'))
     console.log(JSON.parse(item))

As your requirement is to persist the redux state consider using https://github.com/rt2zz/redux-persist Which will persist the state when you close the app.