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+# Building a Volar-Powered Monaco Playground
+
+> [Docs Index](README.md) • [Repo README](../README.md) • [Volar Kit & Editor](volar-kit-and-editor.md) • [Live Examples](live-examples.md)
+
+This guide walks through wiring Volar’s language service into a browser-based playground (Vue SFC REPL, documentation site, or sandbox) using `@volar/monaco`.
+
+## Architecture
+
+```
+Monaco Editor (main thread)
+  │
+  ├─ Worker (language service)
+  │    ├─ TypeScript runtime
+  │    ├─ Volar language service
+  │    └─ Virtual file system (in-memory / IndexedDB)
+  └─ UI (tabs, preview)
+```
+
+## Step 1: Install Dependencies
+
+```bash
+npm install monaco-editor @volar/monaco typescript
+```
+
+## Step 2: Worker Setup
+
+```ts
+// volar.worker.ts
+import * as monaco from 'monaco-editor/esm/vs/editor/editor.api';
+import { setupLanguageServiceForMonaco } from '@volar/monaco';
+
+setupLanguageServiceForMonaco(monaco, {
+  loadTypescript: () => import('typescript/lib/typescript.js'),
+  loadLanguageService: () => import('./volar-service-entry'),
+});
+```
+
+`volar-service-entry` exports `createLanguageService(env)` that mirrors your server’s factory.
+
+## Step 3: Main Thread Wiring
+
+```ts
+import * as monaco from 'monaco-editor';
+
+monaco.languages.register({ id: 'vue' });
+monaco.languages.onLanguage('vue', () => {
+  new Worker(new URL('./volar.worker.ts', import.meta.url), { type: 'module' });
+});
+
+const model = monaco.editor.createModel('<template>hi</template>', 'vue', monaco.Uri.parse('file:///App.vue'));
+monaco.editor.create(document.getElementById('editor')!, { model });
+```
+
+## Step 4: Virtual File System
+
+Track files and sync them with the language service host:
+
+```ts
+const files = new Map<string, string>();
+
+function syncModel(model: monaco.editor.ITextModel) {
+  const uri = model.uri.toString();
+  files.set(uri, model.getValue());
+  languageServiceHost.writeFile(uri, model.getValue());
+}
+
+monaco.editor.onDidCreateModel((model) => {
+  syncModel(model);
+  model.onDidChangeContent(() => syncModel(model));
+});
+```
+
+Persist files using `localStorage`, IndexedDB, or encoded URLs so sessions can be shared.
+
+## Step 5: Preview / Output Integration
+
+- Render an iframe or use the Vue runtime to preview components.
+- Listen for diagnostics via Monaco markers and show a summary list.
+- Capture console output from the preview iframe for debugging.
+
+## Performance Tips
+
+1. Lazy-load worker bundle when a Vue file is opened.
+2. Debounce file sync to avoid flooding the worker.
+3. Reuse the same TypeScript module across workers (via CDN) to reduce bundle size.
+4. For large projects, load files on demand instead of preloading entire repos.
+
+## Example Projects
+
+- [Vue SFC Playground](https://github.com/vuejs/repl)
+- [StackBlitz Vue starter](https://stackblitz.com/edit/vue)
+- [CodeSandbox Projects](https://codesandbox.io/p/dashboard)
+
+By reusing your existing Volar language-service factory in the browser, you guarantee parity between editor IntelliSense and playground experiences.