json_model

Gernerating Dart model class from Json file.

Installing

dev_dependencies:
  json_model: #latest version
  build_runner: ^1.0.0
  json_serializable: ^2.0.0

Getting Started

Create a "jsons" directory in the root of your project;
Create a Json file under "jsons" dir ;
Run flutter packages pub run json_model (in Flutter) or pub run json_model (in Dart VM)

Examples

File: jsons/user.json

{
  "name":"wendux",
  "father":"$user", //Other class model 
  "friends":"$[]user", // Array  
  "keywords":"$[]String", // Array
  "age":20
}

Run pub run json_model, then you'll see the generated json file under lib/models/ dir:

import 'package:json_annotation/json_annotation.dart';
part 'user.g.dart';

@JsonSerializable()
class User {
    User();
    
    String name;
    User father;
    List<User> friends;
    List<String> keywords;
    num age;
    
    factory User.fromJson(Map<String,dynamic> json) => _$UserFromJson(json);
    Map<String, dynamic> toJson() => _$UserToJson(this);
}

@JsonKey

You can also use “@JsonKey” annotation from json_annotation package.

{
  "@JsonKey(ignore: true) dynamic":"md",
  "@JsonKey(name: '+1') int": "loved",
  "name":"wendux",
  "age":20
}

The generated class is:

import 'package:json_annotation/json_annotation.dart';
part 'user.g.dart';

@JsonSerializable()
class User {
    User();

    @JsonKey(ignore: true) dynamic md;
    @JsonKey(name: '+1') int loved;
    String name;
    num age;
    
    factory User.fromJson(Map<String,dynamic> json) => _$UserFromJson(json);
    Map<String, dynamic> toJson() => _$UserToJson(this);
}

Test:

import 'models/index.dart';

void main() {
  var u = User.fromJson({"name": "Jack", "age": 16, "+1": 20});
  print(u.loved); // 20
}

@Import

{
  "@import":"test_dir/profile.dart", //import file for model class
  "@JsonKey(ignore: true) Profile":"profile",
  "name":"wendux",
  "age":20
}

The generated class:

import 'package:json_annotation/json_annotation.dart';
import 'test_dir/profile.dart';  // import file
part 'user.g.dart';

@JsonSerializable()
class User {
    User();

    @JsonKey(ignore: true) Profile profile; //file
    String name;
    num age;
    
    factory User.fromJson(Map<String,dynamic> json) => _$UserFromJson(json);
    Map<String, dynamic> toJson() => _$UserToJson(this);
}

For completed examples see here .

Command arguments

The default json source file directory is project_root/jsons; you can custom the src file directory by src argument, for example:

pub run json_model src=json_files

You can also custom the dist directory by dist argument:

pub run json_model src=json_files  dist=data # will save in lib/data dir

The dist root is lib

Run by code

If you want to run json_model by code instead command line, you can:

import 'package:json_model/json_model.dart';
void main() {
  run(['src=jsons']);  //run
}

parkmap/json_model