9.1.3 • Public • Published

Object-oriented programming framework for Javascript.

Latest version is : NPM Version



  • More Classical OOP
  • Inheritance and Composition
  • Interfaces (and Mix-ins and Traits)
  • Class extenders
  • Method and attribute scopes (public, protected and private)
  • Base classes and interfaces
  • Expandable objects (these objects can be extended like a class)
  • Custom events management
  • DOM events management
  • NodeJs events management
  • Exceptions
  • Singletons
  • Polymorphism
  • Static classes
  • Useful utility functions
  • Namespaces and a registry
  • Compatible with most recent browsers (excepted Microsoft Internet Explorer) and Node.Js (6, 7, 8 and 9).
  • Compatible with Windows, Linux and MacOS X (and Android).
  • Supports browserify and webpack.

Quick Start

Browsers (with a bundler)

Do a normal "require" of the package "@doodad-js/core" in your code, and create your bundle with "browserify" or "webpack".

NOTE: The entry point should automatically be set to "browserify/browserify.min.js".

Browsers (without a bundler)

Download and extract the .zip file from the latest release.

In your HTML file, load JSON5, UUID and the Doodad package :

    <script src="dist/@doodad-js/core/lib/json5/json5.min.js"></script>
    <script src="dist/@doodad-js/core/lib/uuid/uuid.min.js"></script>
    <script src="dist/@doodad-js/core/core.min.js"></script>

or their debug version :

    <script src="dist/@doodad-js/core/lib/json5/json5.js"></script>
    <script src="dist/@doodad-js/core/lib/uuid/uuid.js"></script>
    <script src="dist/@doodad-js/core/core.js"></script>

From Javascript, when the scripts are loaded, create the root namespace :

        .then((root) => {
            // Your code there...
        .catch(err => {

You can create a shortcut to the namespaces this way :

    const doodad = root.Doodad,
        types = doodad.Types,
        tools = doodad.Tools,
        mixins = doodad.MixIns,
        interfaces = doodad.Interfaces,
        extenders = doodad.Extenders,
        namespaces = doodad.Namespaces,
        ... ;


Download and install Doodad from NPM using the command prompt (Windows) or your favorite shell (Unix/Linux) :

    npm install @doodad-js/core --save

By default, Doodad is running in production mode, which disables every validations. You may want to activate the development mode by setting the "NODE_ENV" environment variable :

Windows (command prompt) :

    set NODE_ENV=development

Linux/Unix (shell) :

    export NODE_ENV=development

Now, in your Node.js script, create the root namespace :

        .then((root) => {
            // Your code there...
        .catch(err => {

You can create a shortcut to the namespaces this way :

    const doodad = root.Doodad,
        types = doodad.Types,
        tools = doodad.Tools,
        mixins = doodad.MixIns,
        interfaces = doodad.Interfaces,
        extenders = doodad.Extenders,
        namespaces = doodad.Namespaces,
        ... ;

Source code

Doodad must be built using @doodad-js/make and its dependencies.


  • doodad.PUBLIC: Accessible from the outside.
  • doodad.PROTECTED: Accessible from the inside only.
  • doodad.PRIVATE: Accessible only from the inside of the prototype. Can't be overriden or replaced.

Protection level

First, for the private and the protected scopes to work, Doodad must use Javascript object properties, which have big impacts on performances. That's why they are disabled in production mode.

Also, Doodad allows reflection on every fields and methods to all loaded Doodad modules, but NOT to external scripts.

Last, the efficiency of these scopes depends on an internal flag that remembers in which class instance we are while executing a method. Unfortunatly, because Javascript's strict mode refuses access to the caller's object, Doodad can't know with precision when we leave the framework's context. To rectify this issue, I've recently (since the version 9.0.0) added a new method accessible by "this.callOutside" with a new callback type accessible by "doodad.OutsideCallback". You have to use one of them when you are inside a method and calling something, or getting called by something, that should be external to the object, like a callback function, or an external library if it can hold a reference to your object. I'm sorry for the inconveniences.

If you absolutely want private and protected scopes on production, and don't care about performances, you can pass these options to "createRoot" :

    startup: {
        enableProperties: true
    Doodad: {
        enforceScopes: true

Class Modifiers

Attribute Modifiers :

  • doodad.ATTRIBUTE: Explicitly defines an attribute. Can be used to specify an extender, and/or extender options.
  • doodad.OPTIONS: Defines extender options.
  • doodad.PRE_EXTEND: Tells that an attribute must be extended before normal (non pre-extended) attributes.
  • doodad.TYPE: Attribute is accessible from its Type (ie class).
  • doodad.INSTANCE: Attribute is accessible from an instance of its Type (ie class).
  • doodad.PERSISTENT: Attribute is not deleted on destroy.
  • doodad.READ_ONLY: Attribute can't be modified.
  • doodad.ASYNC: Method will allways returns a Promise.
  • doodad.METHOD: Explicitly defines an attribute as a method.
  • doodad.JS_METHOD: Defines an attribute as a "pure" Javascript function.
  • doodad.PROPERTY: Defines a property (with getter and setter).
  • doodad.EVENT: Defines an event attribute.
  • doodad.ERROR_EVENT: Defines an error event attribute.
  • doodad.WHEN: Specifies that the attribute is skipped until every specified types gets implemented.
  • (client-side only) doodad.JS_EVENT: Defines a DOM event attribute.
  • (server-side only) doodad.NODE_EVENT: Defines a Node.Js event attribute.

Method Modifiers

  • doodad.MUST_OVERRIDE: The method must be overriden within another class.
  • doodad.REPLACE: The method's functions stack gets deleted and replaced by the new function.
  • doodad.OVERRIDE: The new function is appended to the method's functions stack.
  • doodad.CREATE_REPLACE: Same as "doodad.REPLACE", but the method will get created if it doesn't exist.
  • doodad.CREATE_OVERRIDE: Same as "doodad.OVERRIDE", but the method will get created if it doesn't exist.
  • doodad.OBSOLETE: The method is obsolete and will write a warning on the "console" when called for the first time.
  • doodad.CALL_FIRST: Roughly, the function is prepend to the method's functions stack.
  • doodad.CAN_BE_DESTROYED: The method can be called even when the object has been destroyed.
  • doodad.NOT_IMPLEMENTED: The method exists, but it is not implemented until it will get overriden or replaced.
  • doodad.RETURNS: Specifies a validator to the method's returned value.
  • doodad.SUPER: For methods defined with "doodad.JS_METHOD", used to override a method.
  • doodad.BIND: Binds a method to its object.
  • doodad.NON_REENTRANT: The method must exits before being able to call it again.
  • doodad.EXTERNAL: The method can't be called from inside the object.
  • doodad.AFTER: When combined with "doodad.OVERRIDE", the function will get inserted in the stack after the function of the specified class.
  • doodad.BEFORE: When combined with "doodad.OVERRIDE", the function will get inserted in the stack before the function of the specified class.
  • doodad.RENAME_OVERRIDE: Like "doodad.OVERRIDE", but also renames the method. To be used when implementing a Trait.
  • doodad.RENAME_REPLACE: Like "doodad.REPLACE", but also renames the method. To be used when implementing a Trait.

Available extenders

  • extenders.Attribute: (inherits 'extenders.Extender') Extends an attribute with a new value.
  • extenders.Null: (inherits 'extenders.Attribute') Extends an attribute with 'null'.
  • extenders.ClonedAttribute: (inherits 'extenders.Attribute') When an object gets instantiated, the attribute's value is cloned.
  • extenders.ExtendObject: (inherits 'extenders.ClonedAttribute') When overriden, the attribute's object value will get extended instead of replaced.
  • extenders.UniqueArray: (inherits 'extenders.ClonedAttribute') When overriden, the attribute's array value will get appended instead of replaced. Duplicates are removed.
  • extenders.Method: (inherits 'extenders.ClonedAttribute') Extends a method.
  • extenders.JsMethod: (inherits 'extenders.Method') Extends a Javascript method.
  • extenders.Property: (inherits 'extenders.Method') Extends a property.
  • extenders.Event: (inherits 'extenders.Method') Extends an event attribute.
  • (client-side only) extenders.JsEvent: (inherits 'extenders.Event') Extends a DOM event attribute.
  • (server-side only) extenders.NodeEvent: (inherits 'extenders.Event') Extends a Node.Js event attribute.

Pre-built Interfaces and Mix-Ins

  • interfaces.Clonable: (interface) Makes a class clonable.
  • interfaces.Serializable: (interface) Makes a class serializable and desializable.
  • mixins.Creatable: (mix-in) Makes a class creatable.
  • mixins.Translatable: (mix-in) Makes a localized class object.
  • mixins.Configurable: (mix-in) Makes a configurable class object.
  • mixins.Events: (mix-in) Makes a class with events.
  • (client-side only) mixins.JsEvents: (mix-in) Makes a class with managed Javascript events.
  • (server-side only) mixins.NodeEvents: (mix-in) Makes a class with managed NodeJs events.

Pre-built Types

  • types.Type: The base of every types.
  • types.CustomEvent: (inherits 'types.Type') Custom event type for custom event targets.
  • types.CustomEventTarget: (inherits 'types.Type') Custom event targets.
  • types.Namespace: (inherits 'types.CustomEventTarget') Namespace object.

Pre-built Errors

  • types.Error: (inherits 'global.Error') Generic error with message formatting.
  • types.ValueError: (inherits 'types.Error') Raised on invalid value.
  • types.AssertionError: (inherits 'types.Error') Raised when an assertion fail.
  • types.ParseError: (inherits 'types.Error') Raised on parse error.
  • types.NotSupported: (inherits 'types.Error') Raised when something is not supported.
  • types.NotAvailable: (inherits 'types.Error') Raised when something is not available.
  • types.HttpError: (inherits 'types.Error') Raised on HTTP error.
  • types.BufferOverflow: (inherits 'types.Error') Raised on buffer overflow.
  • types.TimeoutError: (inherits 'types.Error') Raised on timeout.
  • types.CanceledError: (inherits 'types.Error') Raised when an operation has been canceled.
  • types.AccessDenied: (inherits 'types.Error') Raised on access denied or not allowed operations.

Pre-built Classes

  • doodad.Class: (inherits 'types.Type') The base of every classes.
  • doodad.Object: (inherits 'doodad.Class', implements 'mixins.Creatable') The base of every object classes.

Pre-built Exceptions

  • doodad.Application: (inherits 'doodad.Error') Application error. An error with a title to be displayed to the end user. Exemple: "This customer is not allowed to buy this product."


  • namespaces.Entries.Namespace: (inherits 'types.Type') Namespace registry entry.
  • namespaces.Entries.Package: (inherits 'namespaces.Entries.Namespace') Package registry entry.
  • namespaces.Entries.Module: (inherits 'namespaces.Entries.Namespace') Module registry entry.
  • namespaces.Entries.Application: (inherits 'namespaces.Entries.Namespace') Application registry entry.
  • namespaces.get: Returns the namespace object of the specified namespace from the registry.
  • namespaces.load: Load modules and get them ready to be used. Usage: namespaces.load(modules, /optional/options, /optional/callback)
  • [namespace].REGISTER: Registers a class in the namespace object.
  • [namespace].UNREGISTER: Unregisters a class from the namespace object.

More documentation

Suspended because of current proposals to Javascript... In the meantime, you can browse the source files and look at the "DD_DOC" headers.


Example 1 (inheritance):

    const Turtle1 = types.INIT(doodad.Object.$extend({
        $TYPE_NAME: 'Turtle1',

        talk: doodad.PUBLIC(function() {
            return "Hi !";

    const turtle1 = new Turtle1();


    const Turtle2 = types.INIT(Turtle1.$extend({
        $TYPE_NAME: 'Turtle2',

        talk: doodad.OVERRIDE(function() {
            return this._super() + " dOOOOdad";

    const turtle2 = new Turtle2();


Example 2 (interfaces):

    const Turtles = types.INIT(doodad.INTERFACE(doodad.Class.$extend({
        $TYPE_NAME: 'Turtles',

        talk: doodad.PUBLIC(doodad.METHOD()),

    const Turtle1 = types.INIT(doodad.Object.$extend(
                Turtles, // Implements "Turtles"
        $TYPE_NAME: 'Turtle1',

        talk: doodad.OVERRIDE(function() {
            return "Hi";

    const Turtle2 = types.INIT(doodad.Object.$extend(
                Turtles, // Implements "Turtles"
        $TYPE_NAME: 'Turtle2',

        talk: doodad.OVERRIDE(function() {
            return "Bonjour";

    console.log(types._implements(Turtle1, Turtles) && types._implements(Turtle2, Turtles));

Example 3 (mix-ins) :

    const Turtles = types.INIT(doodad.MIX_IN(doodad.Class.$extend({
        $TYPE_NAME: 'Turtles',

        talk: doodad.PUBLIC(function() {
            return "Hi";

    const Turtle1 = types.INIT(doodad.Object.$extend(
                Turtles, // Composes "Turtles"
        $TYPE_NAME: 'Turtle1',
    console.log(types._implements(Turtle1, Turtles));

Example 4 (traits) :

    const TAnimals = types.INIT(doodad.TRAIT(doodad.Class.$extend({
        $TYPE_NAME: 'TAnimals',

        talk: doodad.PUBLIC(function() {
            return this.getPhrase();
        getPhrase: doodad.PROTECTED(doodad.MUST_OVERRIDE()),

    const Turtle = types.INIT(doodad.Object.$extend(
                TAnimals, // Composes "TAnimals"
        $TYPE_NAME: 'Turtles',

        phrase: doodad.PUBLIC(null),
        create: doodad.OVERRIDE(function(phrase) {
            this.phrase = phrase;
        talk: doodad.RENAME_OVERRIDE(function slowTalk() {
            return this._super().split('').join('...');

        getPhrase: doodad.OVERRIDE(function() {
            return this.phrase;

    const turtle = new Turtle("Hi !");


Example 5 (expandable objects) :

    const IAnimal = types.INIT(doodad.INTERFACE(doodad.Class.$extend({
        $TYPE_NAME: 'IAnimal',

        makeNoise: doodad.MUST_OVERRIDE(),

    const perrot = new doodad.Object();

            IAnimal, // Implements "IAnimal"
            phrase: null,
            create: doodad.OVERRIDE(function(phrase) {
                this.phrase = phrase;
            makeNoise: doodad.OVERRIDE(function() {
                return this.phrase;
       .create("Hello world !");



I'm waiting after changes to the Javascript language to get something like :

    class Turtles {

    class SmallTurtle implements Turtles {
        talk() {
            return "hi";

    class GiantTurtle implements Turtles {
        talk() {
            return "HI";

But I'll have to see what is feasible after current proposals like "decorators", "public fields" and "private fields".

I'm also looking more forward on the future : WASM. With that, I hope to be able to make my own JS derived language, cleaned from everything that some like me (or just me) doesn't like, with the addition of my own (and, I believe, more realistic) classes. (Suspended)

Wiped out ?

With all the incoming changes to the Javascript language, "@doodad-js/core" could be reduced to some custom decorators, small utility functions and some prebuilt classes.

Other available packages

  • @doodad-js/core: Object-oriented programming framework (release)
  • @doodad-js/cluster: Cluster manager (alpha)
  • @doodad-js/dates: Dates formatting (beta)
  • @doodad-js/http: Http server (alpha)
  • @doodad-js/http_jsonrpc: JSON-RPC over http server (alpha)
  • @doodad-js/io: I/O module (alpha)
  • @doodad-js/ipc: IPC/RPC server (alpha)
  • @doodad-js/json: JSON parser (alpha)
  • @doodad-js/loader: Scripts loader (beta)
  • @doodad-js/locale: Locales (beta)
  • @doodad-js/make: Make tools for doodad (alpha)
  • @doodad-js/mime: Mime types (beta)
  • @doodad-js/minifiers: Javascript minifier used by doodad (alpha)
  • @doodad-js/safeeval: SafeEval (beta)
  • @doodad-js/server: Servers base module (alpha)
  • @doodad-js/templates: HTML page templates (alpha)
  • @doodad-js/terminal: Terminal (alpha)
  • @doodad-js/test: Test application
  • @doodad-js/unicode: Unicode Tools (beta)
  • @doodad-js/widgets: Widgets base module (alpha)
  • @doodad-js/xml: XML Parser (beta)



This package also includes packages "uuid" and "json5", which are licensed under MIT.


npm i @doodad-js/core

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