API Documentation for: 0.1.0

Behavior3JS Module

Defined in: Behavior3JS:203


Behavior3JS is a Behavior Tree library written in JavaScript. It provides structures and algorithms that assist you in the task of creating intelligent agents for your game or application. Check it out some features of Behavior3JS:

  • Based on the work of (Marzinotto et al., 2014), in which they propose a formal, consistent and general definition of Behavior Trees;
  • Optimized to control multiple agents: you can use a single behavior tree instance to handle hundreds of agents;
  • It was designed to load and save trees in a JSON format, in order to use, edit and test it in multiple environments, tools and languages;
  • A cool visual editor which you can access online;
  • Several composite, decorator and action nodes available within the library. You still can define your own nodes, including composites and decorators;
  • Completely free, the core module and the visual editor are all published under the MIT License, which means that you can use them for your open source and commercial projects;
  • Lightweight, only 11.5KB!

Visit http://behavior3js.guineashots.com to know more!

Core Classes and Functions

This library include the following core structures...


  • BehaviorTree: the structure that represents a Behavior Tree;
  • Blackboard: represents a "memory" in an agent and is required to to run a BehaviorTree;
  • Composite: base class for all composite nodes;
  • Decorator: base class for all decorator nodes;
  • Action: base class for all action nodes;
  • Condition: base class for all condition nodes;


  • Tick: used as container and tracking object through the tree during the tick signal;
  • BaseNode: the base class that provide all common node features;

Some classes are used internally on Behavior3JS, but you may need to access its functionalities eventually, specially the Tick object.

Nodes Included

Composite Nodes:

  • Sequence;
  • Priority;
  • MemSequence;
  • MemPriority;


  • Inverter;
  • Limiter
  • MaxTime;
  • Repeater;
  • RepeaterUntilFailure;
  • RepeaterUntilSuccess;


  • Succeeder;
  • Failer;
  • Error;
  • Runner;
  • Wait.