Json.decode doesn't work with json from assets - json

Question

This line doesn't work, and the code gets stocked there.
var list = json.decode(response) as List<dynamic>;
The response String that I submit is:
final String response = await rootBundle.loadString('assets/madrid.json');
With this JSON:
{
"coord": {
"lon": -3.7026,
"lat": 40.4165
},
"weather": [{
"id": 800,
"main": "Clear",
"description": "clear sky",
"icon": "01n"
}],
"base": "stations",
"main": {
"temp": 297.84,
"feels_like": 297.62,
"temp_min": 294.82,
"temp_max": 299.94,
"pressure": 1017,
"humidity": 48
},
"visibility": 10000,
"wind": {
"speed": 1.34,
"deg": 270,
"gust": 2.68
},
"clouds": {
"all": 0
},
"dt": 1631051279,
"sys": {
"type": 2,
"id": 2007545,
"country": "ES",
"sunrise": 1630993686,
"sunset": 1631039875
},
"timezone": 7200,
"id": 3117735,
"name": "Madrid",
"cod": 200
}
The line doesn't execute and gets stuck there. I tried with other JSON responses, and it worked, but I don't know why this one doesn't.

Answer 1

remove as List<dynamic> from
The problem is you are trying to decode Map data as List
If you face Unable to load asset error add your json path into pubspec.yaml
You need to make sure json is response the same type if want to typecast.
Following json will work fine with as List<dynamic>
[
{ "key1": "value" },
{ "key2": "value" },
{ "key3": "value" },
{ "key4": "value" }
]
Example with above json file
final String response = await rootBundle.loadString('assets/list.json');
var dataTypeCast = json.decode(response) as List<dynamic>;
print(dataTypeCast.runtimeType); //List<dynamic>
better approach is removing type casting when decoding unknown response
final String response = await rootBundle.loadString('assets/list.json');
var data = json.decode(response);
print(data.runtimeType); // List<dynamic>