Check item exist in async storage react native

Mishen Thakshana 0
Viewed 63

I'm using this package @react-native-async-storage/async-storage package,

I have made a function to check whether a key exists, if so return true else return false.

Here is my code,

export const isAuthuenticated = async () => {
  try {
    const data = await AsyncStorage.getItem('@app_user');
    if (data) return true;
  } catch (e) {
    return false;
  }
};

console.log(isAuthuenticated())

When I try to console log this isAuthenticated() method it gives me an object like this,

{"_h": 0, "_i": 0, "_j": null, "_k": null}

But I'm expecting to get true/false as the returned value.

Update:

So I used .then() statement since isAuthenticated() function is asynchronous, but I receive an error saying Objects are not valid as a React child , This is my code,

import {isAuthenticated} from './src/middleware/middleware';

const App = async () => {
  return (
    <NavigationContainer>
      {isAuthenticated().then(res => res && <AuthNavigator />)};
    </NavigationContainer>
  );
};

export default App;
asyncstorage react-native reactjs
1 Answers

An async function always returns a promise. So what you need to do to get a boolean result is to either do

const res = await isAuthenticated();
console.log(res)

Or

isAuthenticated().then(res=>console.log(res))

If you want to use this in a component, you can simply store the value using an effect as such.

    const App = () => {
      const [flag,setFlag] = useState(false);
      useEffect(()=>{
      (
        async()=>{
         const x= await isAuthenticated();
         setFlag(x);
        })()},
      [flag])

      return (
        <NavigationContainer>
          {flag && <AuthNavigator />};
        </NavigationContainer>
      );
    };
    
    export default App;
Vin Xi0
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