json2object 2.0.1

Initialize object directly from json with macro

Released 2017-01-28.

To install, run:

haxelib install json2object 2.0.1

See using Haxelib in Haxelib documentation for more information.

Current version2.0.1
StatisticsInstalled 33 times
Tags cross, json, macro


Build Status

json2object - intialized object directly from json

This library uses macro and a typed position aware JSON parsing (hxjsonast : https://github.com/nadako/hxjsonast/) to create a parser from json to every supportable object.

Incorrect json files or mismatched between the object and the json will yield warnings or exceptions, with information on the position of the problematic parts.


haxelib install json2object


Using the parser

var parser = new json2object.JsonParser<Cls>(); // Creating a parser for Cls class
parser.fromJson(jsonString, filename); // Parsing a string. A filename is specified for errors management
var data:Cls = parser.data; // Access the parsed class
var warnings:Array<json2object.Error> = parser.warnings; // Access the potential warnings

It is also possible to populate an existing Array with the warnings

var warnings = new Array<json2object.Error>();
var data:Cls = new json2object.JsonParser<Cls>(warnings).fromJson(jsonString, filename);

Constraints in the parsing

  • Variables defined with the @:jignored metada will be ignored by the parser.
  • Variables defined with the @:optional metada wont trigger warnings if missing.
  • Private variables are ignored.

Supported types

  • Basic types (Int, Float, Bool, String)
  • Null and Array
  • Map with Int or String keys
  • class object (generic are supported)
  • typedef of a supported types

Anonymous types and abstracts are not supported unless specificaly precised.


import json2object.JsonParser;

class Main {
	static function main() {
		var parser = new JsonParser<Data>();
		var data = parser.fromJson('{"a": "a", "b": {"c": "c"}, "e": [ { "c": "1" }, { "c": "2" } ], "f": [], "g": [ true ] }', "file.json");
		var warnings = parser.warnings;


		for (e in data.e) {


		for (g in data.g) {

		for (w in warnings) {
			switch(w) {
				case IncorrectType(variable, expected, pos):
				case UninitializedVariable(variable, pos):
				case UnknownVariable(variable, pos):

class Data {
	public var a:String;
	public var b:SubData;
	public var d:Array<Int>;
	public var e:Array<Map<String, String>>;
	public var f:Array<Float>;
	public var g:Array<Bool>;
	public var h:Math;

	public function new() {

class SubData {
	public var c:String;

	public function new() {