lernajs

lernajs is an open-source JavaScript library designed to help developers create interactive learning experiences on the web. It provides a lightweight, component-based framework for building lessons that include explanatory text, runnable code examples, and assessment steps. The goal is to enable educators and developers to deliver guided coding tutorials and exercises directly in the browser with minimal setup.

Architecturally, lernajs emphasizes modularity and extensibility. It offers core services for step management, progress tracking, and event hooks, and it can integrate with in-browser editors or sandboxed code execution environments. The API supports custom evaluation logic for user submissions and allows lessons to be embedded into websites or apps. The project also prioritizes accessibility, responsive design, and progressive enhancement.

Usage and ecosystem: lernajs is intended for static sites and modern web applications, compatible with common build tools and module systems. It can be extended with plugins or adapters to connect with external services such as version control or learning-management systems. The project is released under an open-source license and maintained by a community of contributors, with development coordinated via public issue trackers and contribution guidelines.

See also: interactive coding tutorials, in-browser code editors.