How to pretty-print JSON using Dart.

README.md

#dart:convert example

How to pretty-print JSON using Dart.

How to display JSON in an easy-to-read (for human readers) format.

Main library: dart:convert
Main element: JsonEncoder.withIndent
Gist: https://gist.github.com/kasperpeulen/d61029fc0bc6cd104602
DartPad: https://dartpad.dartlang.org/d61029fc0bc6cd104602
Tags: #json #pretty-print

main.dart

import 'dart:convert';

main() {
  Map json = {
    'name' : 'Kasper Peulen',
    'best_language': 'dart',
    'best_chat': 'https://dartlang.slack.com'
  };
  JsonEncoder encoder = new JsonEncoder.withIndent('  ');
  String prettyprint = encoder.convert(json);
  print(prettyprint);
}

pubspec.yaml

name: dart.convert_JsonEncoder.withIndent
description: |
  How to pretty-print JSON using Dart.

  How to display JSON in an easy-to-read (for human readers) format.
tags: 'json pretty-print'
homepage: https://gist.github.com/kasperpeulen/d61029fc0bc6cd104602
environment:
  sdk: '>=1.0.0 <2.0.0'

So helpful thank you!

if the log content is to long , it still cannot print totally

JsonEncoder encoder = new JsonEncoder.withIndent('  ');
String prettyprint = encoder.convert(yourJsonString);
debugPrint(prettyprint);

@zouzhenglu you can try it

It works! Thank you

Spot on, thanks

For long logs, this works fine:

  static JsonDecoder decoder = JsonDecoder();
  static JsonEncoder encoder = JsonEncoder.withIndent('  ');

  static void prettyPrintJson(String input) {
    var object = decoder.convert(input);
    var prettyString = encoder.convert(object);
    prettyString.split('\n').forEach((element) => print(element));
  }

Thanks a lot. It is really helpful!

For long logs, this works fine:

  static JsonDecoder decoder = JsonDecoder();
  static JsonEncoder encoder = JsonEncoder.withIndent('  ');

  static void prettyPrintJson(String input) {
    var object = decoder.convert(input);
    var prettyString = encoder.convert(object);
    prettyString.split('\n').forEach((element) => print(element));
  }

This solution worked for me. Thank you. <3

    String yourJson = '{"code":"0","text":"hello world"}';

    var object = json.decode(yourJson);
    var prettyString = JsonEncoder.withIndent('  ').convert(object);
    
    print(prettyString);

Output:: https://i.stack.imgur.com/yDebg.png

Thanks for this, very useful.
I just made this into a small package to keep code clean: pretty_json

Thanks for this, very useful.
I just made this into a small package to keep code clean: pretty_json

Works great, thank you! Very convenient to have on pub.dev!

I wish you could support Lists too

I wish you could support Lists too

+1

Works brilliantly, thank you!

This is helpful, thank you!

This is great!

thank you

For long logs, this works fine:

  static JsonDecoder decoder = JsonDecoder();
  static JsonEncoder encoder = JsonEncoder.withIndent('  ');

  static void prettyPrintJson(String input) {
    var object = decoder.convert(input);
    var prettyString = encoder.convert(object);
    prettyString.split('\n').forEach((element) => print(element));
  }

Excelent, thank you

Thank you

Thank you

It was very helpful, Thanks.

For long logs, this works fine:

  static JsonDecoder decoder = JsonDecoder();
  static JsonEncoder encoder = JsonEncoder.withIndent('  ');

  static void prettyPrintJson(String input) {
    var object = decoder.convert(input);
    var prettyString = encoder.convert(object);
    prettyString.split('\n').forEach((element) => print(element));
  }

Thank you