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ArrowJS

ArrowJS: Type-safe, zero-build UI sandboxes—blazingly fast, tiny.

ArrowJS is a tiny, type-safe reactive UI framework that runs without a build step and stays under 5kb. It isolates agent-generated logic in WebAssembly sandboxes while rendering full inline DOM, making it ideal for safe, flexible, agentic interfaces and fast, maintainable web frontends.

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More about ArrowJS

ArrowJS is a tiny, blazing-fast UI framework designed for the agentic era, built entirely on modern JavaScript and TypeScript primitives. With zero dependencies and no build step, it lets you ship production-ready interfaces using simple modules, functions, and template literals while keeping your bundle under 5kb over the wire.

ArrowJS introduces WebAssembly-powered sandboxes that isolate agent-generated component logic while still rendering full inline DOM directly in your application—no iframes, no rigid, pre-defined components. This makes it ideal for safely embedding LLM- or agent-created UIs that remain fully interactive and maintainable.

Key capabilities include:

Type-safe reactive state via reactive() for live, observable data
Minimal API surface with just three core functions: reactive, html, and component
Vite 8 starter with SSR, hydration, and route-based metadata in a single scaffold command
First-class support for coding agents through an installable Arrow skill wrapper

Use ArrowJS to build fast, maintainable reactive interfaces or to deliver flexible, on-demand agentic UIs without planning every component in advance. With official VSCode syntax highlighting, TypeScript definitions, and an active Discord community, ArrowJS fits naturally into modern developer workflows while enabling a new class of agent-driven frontends.