Flutter - Json.decode返回错误的json

Question

Recently I change all JSON of my app to show the errors, messages, and body of the service. In the body, I have an array of data. Before I change the JSON, all worked doing something like this:

final responseJson = json.decode(response.body);

Which returned:

[{"id":1,"descripcion":"Terreno Rio"},{"id":2,"descripcion":"Terreno Asier"}]

Now I try to do something like this:

final responseJson = json.decode(response.body);
print(json.encode(responseJson));

Which returns:

[{"code":0,"message":"","body":[{"id":1,"descripcion":"Terreno Rio"},{"id":2,"descripcion":"Terreno Asier"}]}]

Does anybody know the right way to extract some element of the JSON and decode?

Answer 1

I'm sure the JSON response that you get is like this:

{"code":0,"message":"","body":[{"id":1,"descripcion":"Terreno Rio"},{"id":2,"descripcion":"Terreno Asier"}]}

So in order to parse that JSON, you can just access the body directly:

List list = responseJson['body'];

Now you can iterate through the elements of the array:

for (Map<String, dynamic> element in list) {
    print(element);
}

Answer 2

You get a List of Maps . First access the first element (there is only 1) of the List with [0] and then the body element of the returned Map with ['body'] :

var body = responseJson[0]['body'];
print(body);