Dart

Loading and Parsing a JSON Array

See more JSON Examples

A JSON array is JSON that begins with "[" and ends with "]". For example, this is a JSON array that contains 3 JSON objects.

[{"name":"jack"},{"name":"john"},{"name":"joe"}]

A JSON object, however, is JSON that begins with "{" and ends with "}". For example, this JSON is an object that contains an array.

{"pets":[{"name":"jack"},{"name":"john"},{"name":"joe"}]}

This example shows how loading a JSON array is different than loading a JSON object. Dart

import 'package:chilkat/chilkat.dart';

void main() {
  final strJsonArray = '[{"name":"jack"},{"name":"john"},{"name":"joe"}]';

  final strJsonObject = '{"pets":[{"name":"jack"},{"name":"john"},{"name":"joe"}]}';

  // A JSON array must be loaded using JsonArray:
  final jsonArray = CkJsonArray();
  jsonArray.load(strJsonArray);

  // Examine the values:
  var i = 0;
  while (i < jsonArray.size) {
    final jsonObj = jsonArray.objectAt(i);
    print('$i: ${jsonObj.stringOf('name')}');

    i++;
  }

  // Output is:

  // 	0: jack
  // 	1: john
  // 	2: joe

  // A JSON object must be loaded using JsonObject
  final jsonObject = CkJsonObject();
  jsonObject.load(strJsonObject);

  // Examine the values:
  i = 0;
  final numPets = jsonObject.sizeOfArray('pets');
  while (i < numPets) {
    jsonObject.i = i;
    print('$i: ${jsonObject.stringOf('pets[i].name')}');
    i++;
  }

  // Output is:

  // 	0: jack
  // 	1: john
  // 	2: joe
}