Sample code for 30+ languages & platforms
Dart

Pretty Print JSON (Formatter, Beautifier)

See more JSON Examples

Demonstrates how to emit JSON in a pretty, human-readable format with indenting of nested arrays and objects.

Chilkat Dart Downloads

Dart
import 'package:chilkat/chilkat.dart';

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

  final jsonStr = '{"name": "donut","image":{"fname": "donut.jpg","w": 200,"h": 200},"thumbnail":{"fname": "donutThumb.jpg","w": 32,"h": 32}}';

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

  // To pretty-print, set the EmitCompact property equal to false
  json.emitCompact = false;

  // If bare-LF line endings are desired, turn off EmitCrLf
  // Otherwise CRLF line endings are emitted.
  json.emitCrLf = false;

  // Emit the formatted JSON:
  print(json.emit());
}