json_to_dart_model_plus 0.0.9

A Dart package for generating Dart model code from JSON.

Dart Model Generator from JSON

This Dart project generates Dart model classes from a given JSON structure. It takes a JSON object as input and outputs a Dart class with:

• Fields that match the JSON structure
• A constructor
• fromJson method for parsing JSON into the model
• toJson method for serializing the model back to JSON
• Handles null safety, allowing fields and the JSON input itself to be null.

Features

• Automatically converts snake_case JSON keys into camelCase Dart field names.
• Supports int, double, String, bool, and dynamic types.
• Nullable fields (?) for null safety.
• Optional inclusion of fields when serializing if the field is null.

How It Works

1. Field Types: The generator automatically infers the field types (e.g., int, String) from the JSON values.
2. Null Safety: All fields are nullable (int?, String?) to handle incomplete or null JSON data.
3. fromJson Method: This method converts a JSON object into the Dart model, with null checks for each field.
4. toJson Method: This method converts the Dart model back to JSON, excluding null fields.

Example

Given the following input JSON:

  {
    "key1": "value1",
    "key2": 123,
    "key3": null,
    "key4": true,
    "key5": 0.3
  }

Example dart code:

import 'dart:convert';

void main() {
  String modelName = 'MyModel';
  String jsonString = '''
  {
    "key1": "value1",
    "key2": 123,
    "key3": null,
    "key4": true,
    "key5": 0.3
  }
  ''';

  Map<String, dynamic> jsonInput = jsonDecode(jsonString);
  String modelCode = JsonToDartModel(modelName: modelName, jsonInput: jsonInput)
      .generateModel();

  print(modelCode);
}

Output will be:

class MyModel {
  String? key1;
  int? key2;
  dynamic key3;
  bool? key4;
  double? key5;
  MyModel({this.key1, this.key2, this.key3, this.key4, this.key5, });

  factory  MyModel.fromJson(Map<String, dynamic>? json) => MyModel(
    key1 : json?['key1'],
    key2 : json?['key2'],
    key3 : json?['key3'],
    key4 : json?['key4'],
    key5 : json?['key5'],
  );

  Map<String, dynamic> toJson() {
    final Map<String, dynamic> data = new Map<String, dynamic>();
    if (this.key1 != null) {
      data['key1'] = this.key1;
    }
    if (this.key2 != null) {
      data['key2'] = this.key2;
    }
    if (this.key3 != null) {
      data['key3'] = this.key3;
    }
    if (this.key4 != null) {
      data['key4'] = this.key4;
    }
    if (this.key5 != null) {
      data['key5'] = this.key5;
    }
    return {"MyModel":data};
  }

  @override
  String toString() {
    return toJson().toString();
  }
}