json_factory_generator library

JSON Factory Generator Library

This library provides automatic code generation for centralized JSON factories that can parse JSON data into strongly-typed Dart objects.

Key Features

• No forced dependencies: Works with any class that has a fromJson method
• Optional json_serializable support: Works with or without @JsonSerializable
• Type-safe: Compile-time generation with runtime type safety
• List support: Handles List<T> parsing with proper generic types

Usage

1. Add the @jsonModel annotation to your model classes:

Manual fromJson (No dependencies)

@jsonModel
class User {
  final String name;

  User({required this.name});

  factory User.fromJson(Map<String, dynamic> json) => User(
    name: json['name'] as String,
  );
}

With json_serializable (Optional)

@jsonModel
@JsonSerializable()
class User {
  final String name;

  User({required this.name});

  factory User.fromJson(Map<String, dynamic> json) => _$UserFromJson(json);
}

2. Run code generation:

dart run build_runner build

3. Use the generated JsonFactory:

final user = JsonFactory.fromJson<User>(jsonData);
final users = JsonFactory.fromJson<List<User>>(jsonList);

The library automatically discovers all annotated models with fromJson methods and generates a centralized factory with type-safe parsing capabilities.

Classes

JsonFactoryBuilder

A custom Builder that generates the centralized JsonFactory implementation.

Functions

jsonFactoryBuilder(BuilderOptions options) → Builder

Creates and configures a Builder for generating the JsonFactory code.