Dart

JSON: Access Array Values

See more JSON Examples

Demonstrates how to access values in a JSON array. Dart

import 'package:chilkat/chilkat.dart';

void main() {
  final json = CkJsonObject();

  final jsonStr = '{ "id": 1, "name": "A green door", "tags": ["home", 22, "green"], "price": 125 }';

  try {
    json.load(jsonStr);
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  // Get the "tags" array, which contains "home", 22, "green"
  final CkJsonArray tagsArray;
  try {
    tagsArray = json.arrayOf('tags');
  } on ChilkatException {
    print('tags member not found.');
    return;
  }

  // Get the value at each array index. 
  // Output will be:
  // [0] = home
  // [0] as integer = 0
  // [1] = 22
  // [1] as integer = 22
  // [2] = green
  // [2] as integer = 0

  final arraySize = tagsArray.size;
  for (var i = 0; i < arraySize; i++) {

    final sValue = tagsArray.stringAt(i);

    print('[$i] = $sValue');

    final iValue = tagsArray.intAt(i);
    print('[$i] as integer = $iValue');
  }

  // Note: The StringAt method returns the value as a string regardless of the type.

  // The IntAt method returns the value as an integer.  If the value does not convert to 
  // an integer, then 0 is returned.
}