Check if key exists in multidimensional json response [Flutter] [Dart]

Question

I'm reading some json data from an http endpoint and continue to work with the result like this:

var decodedResponse = json.decode(response.body);
if(decodedResponse['ingredients']['additives'] != null) {
  getAdditiveList = await getAdditiveNames(decodedResponse['ingredients']['additives']);
  decodedResponse['ingredients']['additives'] = getAdditiveList;
}

Since sometimes the 'additives' or even the 'ingredients' key is not part of the json response, I get the following error:

[VERBOSE-2:ui_dart_state.cc(177)] Unhandled Exception: NoSuchMethodError: The method '[]' was called on null.
Receiver: null
Tried calling: []("additives")

I think the following would technically work as a validation, but it doesn't look like a good idea:

if(decodedResponse.containsKey("ingredients")){
    if(decodedResponse['ingredients'].containsKey("additives")){
    }
}

Any help would be appreciated! Thanks!

AyadRocketfy · Accepted Answer · 2020-11-24 16:25:24Z

2

Looks like sometimes your decodedResponse value is null. You should check like this:

if(decodedResponse != null && decodedResponse['ingredients'] != null && decodedResponse['ingredients']['additives'] != null){}

Like this you will check always if it has a value because it seams like your response from the API sometimes gives you null.

answered Nov 24, 2020 at 16:25

AyadRocketfy

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