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FullJS is a complete ecosystem for developing and running applications with JavaScript. It brings together an embedded V8 runtime, a robust server-side application server with full Linux and systemd integration, a KDE Plasma-like frontend GUI library, a set of built-in libraries for common development tasks, and a powerful web-based IDE featuring drag-and-drop GUI design.

JavaScript Runtime

A JavaScript runtime built on the V8 JavaScript engine, using a single-threaded event loop with non-blocking I/O for main execution, and supporting optional Worker threads for parallel tasks The backend is designed to run exclusively on Linux for maximum performance. Supported architectures include:

• amd64
• arm64
• riscv64
• arm

The runtime ensures high performance and efficiency for server-side applications.

Backend

The FullJS backend provides a robust, modular, and secure foundation for running server-side services. It combines modern architectural principles with deep Linux integration to deliver enterprise-grade capabilities.

Key features include:

• Plugin-based architecture – Extend and customize backend functionality through a modular plugin system.
• Microservice-oriented design – Services are isolated and loosely coupled, making them scalable and maintainable.
• Advanced logging – Structured logging with runtime-configurable log levels.
• JWT-based authentication – Secure, standard-compliant authentication mechanism for microservices.
• Built-in user management – Centralized user handling for authentication.
• ABAC (Attribute-Based Access Control) – Fine-grained permission management based on user attributes and policies.
• Full systemd integration – Each microservice can be managed natively as systemd services (start, stop, reload, status).
• Complete D-Bus integration – Native inter-process communication support for Linux server environments.

Frontend

The FullJS frontend is built for **complex, information-driven web applications** rather than content-oriented websites.

Key features include:

• KDE Plasma-inspired look & feel – A modern, desktop-like experience within the browser, including both light and dark color schemes.
• Plugin-based design – Extend the frontend with additional components and modules.
• Core GUI controls – Buttons, icons, dialogs, and essential widgets for building application interfaces.
• Integrated third-party libraries – Support for advanced tools such as Chart.js for charts and Leaflet for maps and geospatial visualization.

Built-In Libraries

FullJS includes a set of built-in JavaScript libraries to simplify common development tasks. Examples of core libraries include:

• File system access (`fs`) – Fully asynchronous I/O powered by Linux `io_uring` for high-performance file operations.
• Thread management (`Worker`) – Manage concurrent tasks efficiently.
• Networking (`Socket`, `http`) – Build robust server and client network applications.
• GUI elements for web-based apps – Buttons, icons, dialogs, and other essential widgets.
• Charts and data visualization (`ChartJS`) – Visualize data directly in your application.
• Logging utilities (`console`) – Structured logging with configurable log levels for easy debugging and monitoring.

These libraries allow developers to build complex applications with minimal effort, while taking full advantage of FullJS's high-performance runtime and system integration.

Web IDE

A web-based Integrated Development Environment (IDE) for creating and managing applications. It enables development of both client-side and server-side code. While the backend requires Linux, client-side applications run in any modern browser (e.g., Google Chrome), making your apps accessible to everyone.

Get Started

To begin using FullJS, explore the following pages:

• Getting Started
• Architecture
• Libraries
• Tutorials