Search JSON

searchjson.dart

import 'dart:convert';

void main() {
  String jsonStr = '[{"asset":"BTC","free":0,"locked":0},{"asset":"LTC","free":0,"locked":0},{"asset":"ETH","free":0,"locked":0},{"asset":"NEO","free":0,"locked":0},{"asset":"BNB","free":0.75884444,"locked":0},{"asset":"QTUM","free":0,"locked":0},{"asset":"EOS","free":0,"locked":0},{"asset":"SNT","free":0,"locked":0},{"asset":"BNT","free":0,"locked":0},{"asset":"GAS","free":0,"locked":0},{"asset":"BCC","free":0,"locked":0},{"asset":"USDT","free":1633.6586226,"locked":0},{"asset":"HSR","free":0,"locked":0},{"asset":"OAX","free":0,"locked":0},{"asset":"DNT","free":0,"locked":0},{"asset":"MCO","free":0,"locked":0},{"asset":"ICN","free":0,"locked":0},{"asset":"ZRX","free":0,"locked":0},{"asset":"OMG","free":0,"locked":0}]';
  List<Map<String, dynamic>> data = jsonDecode(jsonStr);
  Map<String, dynamic> dt = data.firstWhere((dat) => dat['asset'] == 'USDT');
  print(dt['free']);
}