Introduction ​

Everything a tinyjs app can do. Frontend calls live under window.tiny; the backend gets the same calls on its app handle, by the same names — the API map lists every one side by side.

tinyjs makes desktop apps for macOS, Windows and Linux. Where an OS can't do something, the call says so in these docs and rejects or answers 'unsupported' at runtime, so cross-platform code can feature-detect — see portability.

Phones aren't on the roadmap. If you need iOS or Android, Tauri is a good fit.

quick start ​

Install tinyjs, then:

tinyjs new myapp     # a working app: a page, a backend, a tinyjs.json
cd myapp
tinyjs dev           # opens it; edits reload as you save
tinyjs build         # the app to share, in dist/

The page is src/frontend/, the backend src/backend/main.js. They talk like this:

// src/backend/main.js
export const api = {
  greet: ({ name }) => `Hello, ${name}!`,
};

// src/frontend/app.js
tiny.api.call('greet', { name: 'world' }).then((message) => {
  document.body.append(message);   // "Hello, world!"
});

Then build a real one: your first app is a notebook that saves to disk, step by step. For a Vite + React, Vue or Svelte app, use tinyjs new myapp --template.

with a coding agent ​

Every new project includes a tinyjs skill for coding agents, in .claude/skills/tinyjs/ and .agents/skills/tinyjs/, along with the TypeScript types in types/. An agent working in the project picks them up on its own. To point any other AI tool at these docs, give it tinyjs.app/llms.txt (an index linking a markdown copy of every page) or tinyjs.app/llms-full.txt (all of them in one file).