Question

64

How to check if a key exists in AsyncStorage in React Native? getItem() always returns a promise object

rated 0 times [ 65] [ 1] / answers: 1 / hits: 24531 / 7 Years ago, mon, may 22, 2017, 12:00:00

I'm trying to check whether a key is available in AsyncStorage with AsyncStorage.getItem('key_name'). If the key is not available it is not returning null, it still returns following promise object:

Promise

_45:0

_54:null

_65:null

_81:1

My function for getting data is as bellow:

checkItemExists(){

    let context = this;

    try {

        let value = AsyncStorage.getItem('item_key');

        if (value != null){

            // do something 

        }

        else {

            // do something else

        }

    } catch (error) {

    // Error retrieving data

    }

}

How can I check whether a key exists in AsyncStorage or not?

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aleenamarinr

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answered 7 Years ago aleenamarinr · Accepted Answer

You need to add async await, or add .then to the result

async checkUserSignedIn(){

    let context = this;

    try {

       let value = await AsyncStorage.getItem('user');

       if (value != null){

          // do something 

       }

       else {

          // do something else

      }

    } catch (error) {

      // Error retrieving data

    }

}