react-mosaic is a React tiling window manager. It gives you a drag-to-resize, drag-to-rearrange layout of panels that users can freely rearrange — inspired by IDE window management and i3-style tiling.

📖 Documentation · 🎮 Demo · 📚 API reference · 🚚 Migration from v6

npm install react-mosaic-component react react-dom

Import the stylesheet in your app's entry point:

import 'react-mosaic-component/react-mosaic-component.css';

import { Mosaic, MosaicWindow } from 'react-mosaic-component';
import 'react-mosaic-component/react-mosaic-component.css';

export function App() {
  return (
    <div style={{ height: '100vh' }}>
      <Mosaic<string>
        renderTile={(id, path) => (
          <MosaicWindow<string> path={path} title={`Panel ${id}`}>
            <div style={{ padding: 20 }}>Contents of {id}</div>
          </MosaicWindow>
        )}
        initialValue={{
          type: 'split',
          direction: 'row',
          children: ['a', 'b'],
        }}
      />
    </div>
  );
}

That's a two-panel layout with a draggable divider, drag handles on each window title bar, and default toolbar buttons — in 15 lines.

For live editable examples, the n-ary tree model, custom toolbars, tabs, theming, and the full API reference, see the documentation site.

• N-ary tree layouts. A single split can hold any number of children, not just two.
• Tabs as first-class citizens. Tab containers are a node type, not a bolted-on convention.
• Controlled or uncontrolled. Pass value + onChange to manage the tree yourself, or initialValue to let the component own it.
• Drag-and-drop. Built on react-dnd with HTML5 and touch backends.
• Theming. Works with or without Blueprint; ships a default CSS theme plus CSS variables you can override.
• Zero-config migration. Legacy v6 binary trees are auto-converted at render time. convertLegacyToNary is available for explicit upgrades.

Contributions are welcome. See CONTRIBUTING_AI.md for repo layout and development workflow, or jump into the docs:

• Clone and install: npm install
• Start the docs site (hot-reloads the demo and live code blocks): npm start
• Build the library: npm run build:lib
• Run tests: npm test
• Lint: npm run lint

Issues and pull requests: github.com/nomcopter/react-mosaic

Apache License 2.0 — see LICENSE.

Originally developed by Kevin Verdieck at Palantir Technologies, Inc.