Introduction

FullJS Documentation

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 multi-threaded, event-driven JavaScript runtime built on the V8 JavaScript engine. The backend is designed to run exclusively on Linux for maximum performance. Supported architectures include:

• amd64
• arm
• arm64
• riscv64

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

Application Server

The FullJS Application Server is designed to provide a robust, modular, and secure foundation for running backend services. It combines modern architectural principles with deep Linux integration to deliver enterprise-grade capabilities.

Key features include:

• **Plugin-based architecture** – Extend and customize server 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 microservice design.
• **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.
• **Plugin-based design** – Extend the frontend with additional components and modules.
• **Core GUI controls** – Buttons, 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