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Description:

g json

json #
json package spirit by SwiftyJSON.
Example #

// 0x00 import package
import 'package:g_json/g_json.dart';

...

void someMethod() {

final jsonStr = '''
{
"_id": "5f0fd54e54044a55385a0f31",
"name": {
"first": "Coleman",
"last": "Evans"
},
"range": [0, 1, 2, 3, 4, 5, 6,7, 8, 9],
"friends": [
{
"id": 0,
"name": "Gibson Hull"
},
{
"id": 1,
"name": "Dunlap Bush"
},
{
"id": 2,
"name": "Bette Herman"
}
]
}
''';

// 0x01 parse json string to object
final mode = JSON.parse(jsonStr);

final _id = mode['_id'].stringValue;

final secondFriend = mode[['friends', 2]]['name'].stringValue;

print(mode.prettyString());
}

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Initialization #
import 'package:json/json.dart';

final model = JSON(jsonMap);
// or
final model = JSON.parse(jsonString);

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Subscript #

// Getting a string from a JSON Array
final name = json[0].stringValue;

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// Getting an array of string from a JSON Array
final names = json.arrayValue.map((j) => j['name'].stringValue)
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// Getting a string using a path to the element
final path = [1, 'list', 2, 'name'];
final name = json[path].string;
// or
final name = json[[1, 'list', 2, 'name']].string;
// Just the same
final name = json[1]['list'][2]['name'].string;

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Error #

final json = JSON(['name', 'age']);
final name = json[3].string;
if (name != null) {
// Do something you want
} else {
print(json[3].error); // List(3) Index is out of bounds.
}

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final json = JSON({'name': name, 'age': 20});
final address = json['address'].string;
if (address != null) {
// Do something you want
} else {
print(json['address'].error); // "Map["address"] does not exist"
}

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final json = JSON.nil;

print(json[0]); // List(0) failure, It is not a List
print(json[0].error); // List(0) failure, It is not a List

print(json['key']); // Map(key) failure, It is not a Map
print(json['key'].error); // Map(key) failure, It is not a Map

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Optional getter #
// num
final count = json['user']['favourites_count'].num;
if (count != null) {
// DO something
} else {
print(json['user']['favourites_count'].error);
}

// String
final name = json['user']['favourites_name'].string;
if (name != null) {
// DO something
} else {
print(json['user']['favourites_name'].error);
}

// Bool
final isTranslator = json['user']['is_translator'].bool;
if (isTranslator != null) {
// DO something
} else {
print(json['user']['is_translator'].error);
}

...

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Non-optional getter #
Non=optional getter is named xxxValue

// if not a Number or nil, return 0
int id = json['id'].integerValue;

// if not a string or nil, return ''
String name = json['name'].stringValue;

// if not a list or nil return []
List<JSON> list = json['list'].listValue;

// if not a map or nil, return {}
Map<String, JSON> map = json['map'].mapValue;

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Setter #

json['name'] = 'G_JSON';
json[0] = 1;

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Raw object && convert to jsonString #

// raw
final value = json.value;

// json string
final jsonString = json.rawString();

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Dynamic member #

dynamic person = JSON({'name': 'kevin', 'language': 'dart'});

person.name = 'icey';
person.language = 'Swift';

print(person.rawString()); // {"name": "icey", "language": "swift"}

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