How to handle non-json data and deserialize it in Flutter? - json

Question

I'm working on a project in flutter and I'm trying to use an API for CO2 Emissions. The endpoint of the API can be found here: http://www.hqcasanova.com/co2/?callback=callback. I'm having issues parsing the data because it isn't valid JSON notation. Is there a way to handle this inconvenience?
This is the current code I have:
Future<CO2Model> fetchCarbonEmissionData() async {
var response = await http.get('http://www.hqcasanova.com/co2/?callback=callback/');
RegExp exp = new RegExp(r"callback\((.*)\)");
var match = exp.firstMatch(json.encode(response.body));
print(match.group(0));
try {
if(response.statusCode == HTTP_SUCCESS_CODE) {
var jsonData = jsonDecode(response.body);
var data = jsonData['callback'];
CO2Model instance = CO2Model.fromJSON(data);
return instance;
} else {
print('failed');
}
} catch (e) {
throw e;
}
}
Note: Above I tried to use Regular Expressions to deal with this, but I'm unable to do so.

Answer 1

I do not suggest you use a regex for such a simple task, especially if you sure that you will always get something like
callback(...)
you could simply trim spaces, and get the substring you want. However, if you want to do it with regex
r'callback\((.*).*\)'
It basically does what I suggested before, take the match that starts begins with the word callback then group the part of the match you want as output (excluding the trailing parenthesis). I hope this helps.