RedBrogdon

import 'package:json_annotation/json_annotation.dart';

@JsonSerializable
class SimpleObject {
  ...
}

RedBrogdon

import 'package:json_annotation/json_annotation.dart';

part 'simple_object.g.dart';

@JsonSerializable()
class SimpleObject extends Object with _$SimpleObjectSerializerMixin {
  SimpleObject({
    this.aString,
    this.anInt,
    this.aDouble,

RedBrogdon

part of 'simple_object.dart';

SimpleObject _$SimpleObjectFromJson(
        Map<String, dynamic> json) =>
    new SimpleObject(
        aString: json['aString'] as String,
        anInt: json['anInt'] as int,
        aDouble: (json['aDouble'] as num)?.toDouble(),
        aListOfStrings:
            (json['aListOfStrings'] as List)?.map((e) => e as String)?.toList(),

RedBrogdon

final myObject = SimpleObject.fromJson(json.decode(jsonString));
final myJsonStr = json.encode(myObject.toJson());

RedBrogdon

import 'package:built_collection/built_collection.dart';
import 'package:built_value/built_value.dart';
import 'package:built_value/serializer.dart';

part 'simple_object.g.dart';

abstract class SimpleObject
    implements Built<SimpleObject, SimpleObjectBuilder> {
  static Serializer<SimpleObject> get serializer =>
      _$SimpleObjectSerializer;

RedBrogdon

final SimpleObject myObject = SimpleObject((b) => b
  ..aString = 'Blah, blah, blah'
  ..anInt = 1
  ..aDouble = 1.0
  ..aListOfStrings = ListBuilder<String>(['one', 'two', 'three'])
  ..aListOfInts = ListBuilder<int>([1, 2, 3])
  ..aListOfDoubles = ListBuilder<double>([1.0, 2.0, 3.0])
);

RedBrogdon

final SimpleObject anotherObject = myObject.rebuild((b) => b
  ..aString = "An updated value"
);

RedBrogdon

SimpleObject._();

RedBrogdon

import 'package:built_collection/built_collection.dart';
import 'package:built_value/serializer.dart';
import 'package:built_value/standard_json_plugin.dart';
import 'simple_object.dart';

part 'serializers.g.dart';

@SerializersFor(const [
  SimpleObject,
])

RedBrogdon

final myObject = serializers.deserializeWith(
    SimpleObject.serializer, json.decode(aJsonString));

final String myJsonString = json.encode(serializers.serialize(myObject));