The goal is provide an accessible JavaScript interface and libraries to enable developers from other disciplines (e.g. Java, .NET) to easily develop JavaScript classes, packages, and objects without a thorough understanding of JavaScript's internals. In addition sjl seeks to provide a basic set of standard libraries that developers can build on.

SJL's model, an issue of debate in some circles, allows developers to directly extend native DOM objects. This allows developers to interact with their own JavaScript classes as native DOM objects rather than require DOM nodes to be addressed and referenced within a class.

In addition sjl seeks to provide developers with namespace support, dynamic package loading, import statements and the like.