What is pocketjs?

PocketJS lets developers write user interfaces using familiar web style code, such as Solid or Vue components, and then run that interface on hardware that has nothing to do with a web browser. The project can build and run the same UI on a real Sony PSP, a PS Vita, emulators for both of those handheld consoles, inside a regular browser, as a native macOS window, or in a backend environment called Bun with no display attached at all. Under the hood, PocketJS moves the actual work of laying out, styling, animating, and drawing text into a small Rust program that does not depend on a full operating system. This is what lets it hit 60 frames per second animation while staying inside an 8 megabyte memory budget, tight enough to run comfortably on aging handheld game console hardware. Styling is written in a Tailwind like shorthand, but it is fully checked and turned into fixed data at build time rather than being interpreted while the app runs, which keeps things fast and predictable. Building an app is a two step process: first your components are checked and converted, along with a scan of exactly which styles and text characters you actually use, then everything is bundled and packaged into a single file ready to install on the target device. A command line tool called pocket handles setup, checking, compiling, and building for either the PSP or Vita target, and there is also a browser and desktop development mode for testing. The project also includes small reusable interface building blocks such as focusable buttons, modals, and action bars designed for controller based navigation rather than a mouse. It is licensed under MIT, meaning it can be used freely, including commercially, as long as the copyright notice stays intact. With 740 stars, it has a meaningfully active following among developers interested in retro game hardware and embedded interfaces.