commit 463b563423300130ab5a754b6b8bafa6033a041b
Author: root <root@claude.deathstar-home.one>
Date:   Thu Feb 26 08:12:39 2026 -0600

    Initial commit: code playground with multi-framework support
    
    Express + SQLite backend with Monaco editor frontend.
    Supports HTML/CSS/JS, TypeScript, React (JSX/TSX), Vue SFC,
    and Svelte with live preview, console output, save/fork/share.
    
    Includes CSS preprocessors (SCSS, Less), framework-specific
    compilation (Babel, TypeScript, Svelte compiler), and
    CDN-loaded runtime libraries for preview rendering.

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..902b281
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,2 @@
+node_modules/
+data/
diff --git a/db.js b/db.js
new file mode 100644
index 0000000..a66cdb5
--- /dev/null
+++ b/db.js
@@ -0,0 +1,43 @@
+import Database from 'better-sqlite3';
+import { mkdirSync } from 'fs';
+
+mkdirSync('data', { recursive: true });
+
+const db = new Database('data/fiddles.db');
+db.pragma('journal_mode = WAL');
+db.pragma('foreign_keys = ON');
+
+db.exec(`
+  CREATE TABLE IF NOT EXISTS fiddles (
+    id TEXT PRIMARY KEY,
+    title TEXT NOT NULL DEFAULT 'Untitled',
+    html TEXT NOT NULL DEFAULT '',
+    css TEXT NOT NULL DEFAULT '',
+    css_type TEXT NOT NULL DEFAULT 'css',
+    js TEXT NOT NULL DEFAULT '',
+    js_type TEXT NOT NULL DEFAULT 'javascript',
+    created_at TEXT NOT NULL DEFAULT (datetime('now')),
+    updated_at TEXT NOT NULL DEFAULT (datetime('now'))
+  )
+`);
+
+// Migration: add js_type column for existing databases
+try {
+  db.exec(`ALTER TABLE fiddles ADD COLUMN js_type TEXT NOT NULL DEFAULT 'javascript'`);
+} catch (_) { /* column already exists */ }
+
+export const stmts = {
+  insert: db.prepare(`
+    INSERT INTO fiddles (id, title, html, css, css_type, js, js_type)
+    VALUES (@id, @title, @html, @css, @css_type, @js, @js_type)
+  `),
+  get: db.prepare('SELECT * FROM fiddles WHERE id = ?'),
+  update: db.prepare(`
+    UPDATE fiddles SET title = @title, html = @html, css = @css,
+      css_type = @css_type, js = @js, js_type = @js_type, updated_at = datetime('now')
+    WHERE id = @id
+  `),
+  list: db.prepare('SELECT id, title, css_type, js_type, created_at, updated_at FROM fiddles ORDER BY updated_at DESC LIMIT 50'),
+};
+
+export default db;
diff --git a/package-lock.json b/package-lock.json
new file mode 100644
index 0000000..68667ae
--- /dev/null
+++ b/package-lock.json
@@ -0,0 +1,1362 @@
+{
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+  "version": "1.0.0",
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+        "nanoid": "^5.0.0"
+      },
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+      }
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+      }
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+      },
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+      }
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+      "engines": {
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+    }
+  }
+}
diff --git a/package.json b/package.json
new file mode 100644
index 0000000..857202a
--- /dev/null
+++ b/package.json
@@ -0,0 +1,16 @@
+{
+  "name": "fiddle",
+  "version": "1.0.0",
+  "type": "module",
+  "scripts": {
+    "start": "node server.js"
+  },
+  "dependencies": {
+    "better-sqlite3": "^11.0.0",
+    "express": "^4.21.0",
+    "nanoid": "^5.0.0"
+  },
+  "devDependencies": {
+    "svelte": "^4.2.19"
+  }
+}
diff --git a/public/css/style.css b/public/css/style.css
new file mode 100644
index 0000000..0d3543e
--- /dev/null
+++ b/public/css/style.css
@@ -0,0 +1,148 @@
+*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
+
+:root {
+  --bg: #1e1e1e;
+  --surface: #252526;
+  --border: #3c3c3c;
+  --text: #cccccc;
+  --text-dim: #888;
+  --accent: #0078d4;
+  --accent-hover: #1a8ceb;
+  --toolbar-h: 44px;
+  --tab-h: 32px;
+  --label-h: 26px;
+}
+
+html, body { height: 100%; overflow: hidden; font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif; background: var(--bg); color: var(--text); }
+
+/* Toolbar */
+.toolbar {
+  height: var(--toolbar-h);
+  display: flex;
+  align-items: center;
+  justify-content: space-between;
+  padding: 0 12px;
+  background: var(--surface);
+  border-bottom: 1px solid var(--border);
+  gap: 8px;
+}
+.toolbar-left, .toolbar-right { display: flex; align-items: center; gap: 8px; }
+.logo { font-weight: 700; font-size: 16px; color: var(--accent); text-decoration: none; }
+#title-input {
+  background: transparent; border: 1px solid transparent; color: var(--text);
+  padding: 4px 8px; border-radius: 4px; font-size: 13px; width: 180px;
+}
+#title-input:hover, #title-input:focus { border-color: var(--border); outline: none; }
+#framework-mode {
+  background: var(--bg); color: var(--text); border: 1px solid var(--border);
+  padding: 4px 6px; border-radius: 4px; font-size: 12px; cursor: pointer;
+}
+button {
+  background: var(--accent); color: #fff; border: none; padding: 5px 14px;
+  border-radius: 4px; font-size: 12px; cursor: pointer; font-weight: 500;
+}
+button:hover { background: var(--accent-hover); }
+.btn-small {
+  background: transparent; color: var(--text-dim); padding: 2px 6px; font-size: 11px;
+}
+.btn-small:hover { color: var(--text); background: var(--border); }
+
+/* Grid layout — 2 columns: editor | preview+console */
+.grid {
+  display: grid;
+  grid-template-columns: 1fr 1fr;
+  grid-template-rows: 1fr 1fr;
+  height: calc(100vh - var(--toolbar-h));
+}
+.panel { position: relative; border: 1px solid var(--border); overflow: hidden; display: flex; flex-direction: column; }
+.panel-label {
+  height: var(--label-h); line-height: var(--label-h);
+  padding: 0 10px; font-size: 11px; font-weight: 600;
+  text-transform: uppercase; color: var(--text-dim);
+  background: var(--surface); border-bottom: 1px solid var(--border);
+  display: flex; align-items: center; justify-content: space-between;
+  flex-shrink: 0;
+}
+
+/* Editor panel — full left column */
+.panel-editor  { grid-column: 1; grid-row: 1 / 3; display: flex; flex-direction: column; }
+.panel-preview { grid-column: 2; grid-row: 1; }
+.panel-console { grid-column: 2; grid-row: 2; }
+
+/* Tab bar */
+.tab-bar {
+  height: var(--tab-h);
+  display: flex;
+  align-items: stretch;
+  background: var(--surface);
+  border-bottom: 1px solid var(--border);
+  flex-shrink: 0;
+  gap: 0;
+  overflow-x: auto;
+}
+.tab-btn {
+  background: transparent;
+  color: var(--text-dim);
+  border: none;
+  border-bottom: 2px solid transparent;
+  padding: 0 14px;
+  font-size: 12px;
+  font-weight: 500;
+  cursor: pointer;
+  border-radius: 0;
+  white-space: nowrap;
+  display: flex;
+  align-items: center;
+  gap: 6px;
+}
+.tab-btn:hover {
+  color: var(--text);
+  background: rgba(255,255,255,0.04);
+}
+.tab-btn.active {
+  color: var(--text);
+  border-bottom-color: var(--accent);
+  background: rgba(255,255,255,0.06);
+}
+
+/* CSS type selector inside tab bar */
+.tab-css-type {
+  background: var(--bg);
+  color: var(--text-dim);
+  border: 1px solid var(--border);
+  padding: 1px 4px;
+  border-radius: 3px;
+  font-size: 10px;
+  cursor: pointer;
+}
+
+/* Editor area — holds all editor containers, only one visible at a time */
+.editor-area { flex: 1; min-height: 0; position: relative; }
+.editor-container {
+  position: absolute;
+  top: 0; left: 0; right: 0; bottom: 0;
+  display: none;
+}
+.editor-container.active { display: block; }
+
+#preview-frame { flex: 1; border: none; background: #fff; width: 100%; }
+
+/* Console */
+#console-output {
+  flex: 1; overflow-y: auto; padding: 6px 10px; font-family: 'Cascadia Code', 'Fira Code', monospace;
+  font-size: 12px; line-height: 1.6; background: var(--bg);
+}
+.console-line { padding: 1px 0; border-bottom: 1px solid #2a2a2a; white-space: pre-wrap; word-break: break-all; }
+.console-log { color: var(--text); }
+.console-warn { color: #cca700; }
+.console-error { color: #f44747; }
+.console-info { color: #3dc9b0; }
+.console-debug { color: #888; }
+
+/* Toast */
+.toast {
+  position: fixed; bottom: 20px; left: 50%; transform: translateX(-50%);
+  background: var(--accent); color: #fff; padding: 8px 18px; border-radius: 6px;
+  font-size: 13px; z-index: 999; transition: opacity 0.3s;
+}
+.toast.hidden { opacity: 0; pointer-events: none; }
diff --git a/public/index.html b/public/index.html
new file mode 100644
index 0000000..c7f5d34
--- /dev/null
+++ b/public/index.html
@@ -0,0 +1,70 @@
+<!DOCTYPE html>
+<html lang="en">
+<head>
+  <meta charset="UTF-8">
+  <meta name="viewport" content="width=device-width, initial-scale=1.0">
+  <title>Fiddle</title>
+  <link rel="stylesheet" href="/css/style.css">
+</head>
+<body>
+  <header class="toolbar">
+    <div class="toolbar-left">
+      <a href="/" class="logo">Fiddle</a>
+      <select id="framework-mode">
+        <option value="html-css-js">HTML / CSS / JS</option>
+        <option value="typescript">TypeScript</option>
+        <option value="react">React (JSX)</option>
+        <option value="react-ts">React + TS</option>
+        <option value="vue">Vue</option>
+        <option value="svelte">Svelte</option>
+      </select>
+      <input type="text" id="title-input" placeholder="Untitled" spellcheck="false">
+    </div>
+    <div class="toolbar-right">
+      <button id="btn-run" title="Run (Ctrl+Enter)">Run</button>
+      <button id="btn-save" title="Save (Ctrl+S)">Save</button>
+      <button id="btn-fork" title="Fork">Fork</button>
+    </div>
+  </header>
+
+  <main class="grid">
+    <div class="panel panel-editor">
+      <div class="tab-bar" id="tab-bar"></div>
+      <div id="editor-area" class="editor-area"></div>
+    </div>
+    <div class="panel panel-preview">
+      <div class="panel-label">Preview</div>
+      <iframe id="preview-frame" sandbox="allow-scripts allow-same-origin"></iframe>
+    </div>
+    <div class="panel panel-console">
+      <div class="panel-label">Console <button id="btn-clear-console" class="btn-small">Clear</button></div>
+      <div id="console-output"></div>
+    </div>
+  </main>
+
+  <div id="share-toast" class="toast hidden"></div>
+
+  <script>
+    // Monaco AMD loader
+    const MONACO_CDN = 'https://cdnjs.cloudflare.com/ajax/libs/monaco-editor/0.52.2';
+    const script = document.createElement('script');
+    script.src = `${MONACO_CDN}/min/vs/loader.min.js`;
+    script.onload = () => {
+      require.config({ paths: { vs: `${MONACO_CDN}/min/vs` } });
+      // Cross-origin worker proxy
+      window.MonacoEnvironment = {
+        getWorkerUrl: function (_workerId, label) {
+          return `data:text/javascript;charset=utf-8,${encodeURIComponent(`
+            self.MonacoEnvironment = { baseUrl: '${MONACO_CDN}/min/' };
+            importScripts('${MONACO_CDN}/min/vs/base/worker/workerMain.js');
+          `)}`;
+        }
+      };
+      require(['vs/editor/editor.main'], () => {
+        import('/js/app.js');
+      });
+    };
+    document.head.appendChild(script);
+  </script>
+</body>
+</html>
diff --git a/public/js/api.js b/public/js/api.js
new file mode 100644
index 0000000..f358033
--- /dev/null
+++ b/public/js/api.js
@@ -0,0 +1,29 @@
+const BASE = '/api/fiddles';
+
+async function request(url, opts = {}) {
+  const res = await fetch(url, {
+    headers: { 'Content-Type': 'application/json' },
+    ...opts,
+  });
+  if (!res.ok) {
+    const err = await res.json().catch(() => ({ error: res.statusText }));
+    throw new Error(err.error || res.statusText);
+  }
+  return res.json();
+}
+
+export function createFiddle(data) {
+  return request(BASE, { method: 'POST', body: JSON.stringify(data) });
+}
+
+export function loadFiddle(id) {
+  return request(`${BASE}/${id}`);
+}
+
+export function updateFiddle(id, data) {
+  return request(`${BASE}/${id}`, { method: 'PUT', body: JSON.stringify(data) });
+}
+
+export function listFiddles() {
+  return request(BASE);
+}
diff --git a/public/js/app.js b/public/js/app.js
new file mode 100644
index 0000000..0c08e65
--- /dev/null
+++ b/public/js/app.js
@@ -0,0 +1,195 @@
+import {
+  initEditors, switchMode, getEditorValues, setEditorValues,
+  setOnChange, getCurrentMode, getCssType, setCssType,
+  MODE_TABS, MODE_TO_JS_TYPE, JS_TYPE_TO_MODE,
+} from './editors.js';
+import { renderPreview } from './preview.js';
+import { initConsole, clearConsole } from './console-panel.js';
+import { compileCss } from './preprocessors.js';
+import { compileJs } from './js-preprocessors.js';
+import { createFiddle, loadFiddle, updateFiddle } from './api.js';
+
+let currentId = null;
+let debounceTimer = null;
+
+const $ = (sel) => document.querySelector(sel);
+
+const STARTER_TEMPLATES = {
+  'html-css-js': { html: '', css: '', js: '' },
+  'typescript': {
+    html: '<div id="app"></div>',
+    css: '',
+    js: `interface Greeting {\n  name: string;\n  message: string;\n}\n\nconst greet = (g: Greeting): string => \`\${g.message}, \${g.name}!\`;\n\nconst result = greet({ name: "World", message: "Hello" });\ndocument.getElementById("app")!.innerHTML = \`<h1>\${result}</h1>\`;\nconsole.log(result);`,
+  },
+  'react': {
+    js: `const App = () => {\n  const [count, setCount] = React.useState(0);\n  return (\n    <div>\n      <h1>Hello React</h1>\n      <button onClick={() => setCount(c => c + 1)}>Count: {count}</button>\n    </div>\n  );\n};\n\nReactDOM.createRoot(document.getElementById('root')).render(<App />);`,
+    css: '',
+    html: '',
+  },
+  'react-ts': {
+    js: `const App: React.FC = () => {\n  const [count, setCount] = React.useState<number>(0);\n  return (\n    <div>\n      <h1>Hello React + TypeScript</h1>\n      <button onClick={() => setCount(c => c + 1)}>Count: {count}</button>\n    </div>\n  );\n};\n\nReactDOM.createRoot(document.getElementById('root')!).render(<App />);`,
+    css: '',
+    html: '',
+  },
+  'vue': {
+    js: `<template>\n  <div>\n    <h1>{{ msg }}</h1>\n    <button @click="count++">Count: {{ count }}</button>\n  </div>\n</template>\n\n<script>\nconst component = {\n  data() {\n    return {\n      msg: 'Hello Vue!',\n      count: 0,\n    };\n  },\n};\n</script>`,
+    css: '',
+  },
+  'svelte': {
+    js: `<script>\n  let count = 0;\n</script>\n\n<h1>Hello Svelte</h1>\n<button on:click={() => count++}>Count: {count}</button>\n\n<style>\n  h1 { color: #ff3e00; }\n  button { padding: 8px 16px; cursor: pointer; }\n</style>`,
+    css: '',
+  },
+};
+
+async function run() {
+  const mode = getCurrentMode();
+  const { html, css, js } = getEditorValues();
+  const cssType = getCssType();
+
+  try {
+    const compiledCss = await compileCss(css, cssType);
+    const result = await compileJs(js, mode);
+    clearConsole();
+
+    // Show warnings from compilation (e.g., Svelte)
+    if (result.warnings && result.warnings.length) {
+      result.warnings.forEach((w) => {
+        window.postMessage({ type: 'console', method: 'warn', args: [w] }, '*');
+      });
+    }
+
+    renderPreview(html, compiledCss, result.js, mode, result.extraCss || '');
+  } catch (e) {
+    clearConsole();
+    renderPreview(html, '', '', mode);
+    window.postMessage({ type: 'console', method: 'error', args: [`Compile error: ${e.message}`] }, '*');
+  }
+}
+
+function scheduleRun() {
+  clearTimeout(debounceTimer);
+  debounceTimer = setTimeout(run, 500);
+}
+
+function showToast(msg) {
+  const toast = $('#share-toast');
+  toast.textContent = msg;
+  toast.classList.remove('hidden');
+  setTimeout(() => toast.classList.add('hidden'), 3000);
+}
+
+async function save() {
+  const { html, css, js } = getEditorValues();
+  const title = $('#title-input').value || 'Untitled';
+  const css_type = getCssType();
+  const js_type = MODE_TO_JS_TYPE[getCurrentMode()] || 'javascript';
+  try {
+    if (currentId) {
+      await updateFiddle(currentId, { title, html, css, css_type, js, js_type });
+      showToast(`Saved! Share: ${location.origin}/f/${currentId}`);
+    } else {
+      const result = await createFiddle({ title, html, css, css_type, js, js_type });
+      currentId = result.id;
+      history.pushState(null, '', `/f/${currentId}`);
+      showToast(`Saved! Share: ${location.origin}/f/${currentId}`);
+    }
+  } catch (e) {
+    showToast(`Save failed: ${e.message}`);
+  }
+}
+
+async function fork() {
+  const { html, css, js } = getEditorValues();
+  const title = ($('#title-input').value || 'Untitled') + ' (fork)';
+  const css_type = getCssType();
+  const js_type = MODE_TO_JS_TYPE[getCurrentMode()] || 'javascript';
+  try {
+    const result = await createFiddle({ title, html, css, css_type, js, js_type });
+    currentId = result.id;
+    $('#title-input').value = title;
+    history.pushState(null, '', `/f/${currentId}`);
+    showToast(`Forked! New URL: ${location.origin}/f/${currentId}`);
+  } catch (e) {
+    showToast(`Fork failed: ${e.message}`);
+  }
+}
+
+async function loadFromUrl() {
+  const match = location.pathname.match(/^\/f\/([a-zA-Z0-9_-]+)$/);
+  if (!match) return;
+  try {
+    const fiddle = await loadFiddle(match[1]);
+    currentId = fiddle.id;
+    $('#title-input').value = fiddle.title;
+
+    // Restore mode from js_type
+    const mode = JS_TYPE_TO_MODE[fiddle.js_type] || 'html-css-js';
+    $('#framework-mode').value = mode;
+    switchMode(mode);
+
+    // Restore CSS type
+    setCssType(fiddle.css_type || 'css');
+
+    setEditorValues(fiddle);
+    setTimeout(run, 100);
+  } catch (e) {
+    showToast(`Failed to load fiddle: ${e.message}`);
+  }
+}
+
+function handleModeChange(newMode) {
+  const oldMode = getCurrentMode();
+  if (newMode === oldMode) return;
+
+  switchMode(newMode);
+
+  // Insert starter template if editors are empty
+  const { html, css, js } = getEditorValues();
+  if (!html && !css && !js) {
+    const template = STARTER_TEMPLATES[newMode];
+    if (template) {
+      setEditorValues(template);
+    }
+  }
+
+  scheduleRun();
+}
+
+function init() {
+  initEditors('html-css-js');
+  setOnChange(scheduleRun);
+  initConsole();
+
+  // Mode selector
+  $('#framework-mode').addEventListener('change', (e) => {
+    handleModeChange(e.target.value);
+  });
+
+  // Toolbar buttons
+  $('#btn-run').addEventListener('click', run);
+  $('#btn-save').addEventListener('click', save);
+  $('#btn-fork').addEventListener('click', fork);
+
+  // Keyboard shortcuts
+  document.addEventListener('keydown', (e) => {
+    if ((e.ctrlKey || e.metaKey) && e.key === 's') {
+      e.preventDefault();
+      save();
+    }
+    if ((e.ctrlKey || e.metaKey) && e.key === 'Enter') {
+      e.preventDefault();
+      run();
+    }
+  });
+
+  // Load fiddle from URL if present
+  loadFromUrl();
+
+  // Handle browser back/forward
+  window.addEventListener('popstate', () => {
+    currentId = null;
+    loadFromUrl();
+  });
+}
+
+init();
diff --git a/public/js/console-panel.js b/public/js/console-panel.js
new file mode 100644
index 0000000..857bab5
--- /dev/null
+++ b/public/js/console-panel.js
@@ -0,0 +1,27 @@
+const output = () => document.getElementById('console-output');
+
+export function initConsole() {
+  window.addEventListener('message', (e) => {
+    if (!e.data || e.data.type !== 'console') return;
+    if (e.data.method === 'clear') {
+      clearConsole();
+      return;
+    }
+    appendLine(e.data.method, (e.data.args || []).join(' '));
+  });
+
+  document.getElementById('btn-clear-console').addEventListener('click', clearConsole);
+}
+
+function appendLine(method, text) {
+  const el = document.createElement('div');
+  el.className = `console-line console-${method}`;
+  el.textContent = text;
+  const out = output();
+  out.appendChild(el);
+  out.scrollTop = out.scrollHeight;
+}
+
+export function clearConsole() {
+  output().innerHTML = '';
+}
diff --git a/public/js/editors.js b/public/js/editors.js
new file mode 100644
index 0000000..b4521cb
--- /dev/null
+++ b/public/js/editors.js
@@ -0,0 +1,258 @@
+const editorOpts = {
+  minimap: { enabled: false },
+  automaticLayout: true,
+  fontSize: 13,
+  lineNumbers: 'on',
+  scrollBeyondLastLine: false,
+  theme: 'vs-dark',
+  tabSize: 2,
+  renderWhitespace: 'none',
+  padding: { top: 6 },
+};
+
+export const MODE_TABS = {
+  'html-css-js': [
+    { id: 'html', label: 'HTML', lang: 'html' },
+    { id: 'css', label: 'CSS', lang: 'css' },
+    { id: 'js', label: 'JavaScript', lang: 'javascript' },
+  ],
+  'typescript': [
+    { id: 'html', label: 'HTML', lang: 'html' },
+    { id: 'css', label: 'CSS', lang: 'css' },
+    { id: 'js', label: 'TypeScript', lang: 'typescript' },
+  ],
+  'react': [
+    { id: 'js', label: 'JSX', lang: 'javascript' },
+    { id: 'css', label: 'CSS', lang: 'css' },
+    { id: 'html', label: 'HTML', lang: 'html' },
+  ],
+  'react-ts': [
+    { id: 'js', label: 'TSX', lang: 'typescript' },
+    { id: 'css', label: 'CSS', lang: 'css' },
+    { id: 'html', label: 'HTML', lang: 'html' },
+  ],
+  'vue': [
+    { id: 'js', label: 'Vue SFC', lang: 'html' },
+    { id: 'css', label: 'CSS', lang: 'css' },
+  ],
+  'svelte': [
+    { id: 'js', label: 'Svelte', lang: 'html' },
+    { id: 'css', label: 'CSS', lang: 'css' },
+  ],
+};
+
+// Map mode names to js_type values stored in DB
+export const MODE_TO_JS_TYPE = {
+  'html-css-js': 'javascript',
+  'typescript': 'typescript',
+  'react': 'jsx',
+  'react-ts': 'tsx',
+  'vue': 'vue',
+  'svelte': 'svelte',
+};
+
+export const JS_TYPE_TO_MODE = Object.fromEntries(
+  Object.entries(MODE_TO_JS_TYPE).map(([k, v]) => [v, k])
+);
+
+// Editor instances keyed by tab id ('html', 'css', 'js')
+let editors = {};
+let currentMode = 'html-css-js';
+let activeTab = null;
+let cssType = 'css';
+let onChangeCallback = null;
+
+const tabBar = () => document.getElementById('tab-bar');
+const editorArea = () => document.getElementById('editor-area');
+
+export function setOnChange(cb) {
+  onChangeCallback = cb;
+}
+
+export function getCurrentMode() {
+  return currentMode;
+}
+
+export function getCssType() {
+  return cssType;
+}
+
+export function setCssType(type) {
+  cssType = type;
+  const sel = document.getElementById('css-type-select');
+  if (sel) sel.value = type;
+  // Update Monaco language for the CSS editor
+  if (editors.css) {
+    const model = editors.css.getModel();
+    monaco.editor.setModelLanguage(model, type === 'scss' ? 'scss' : type === 'less' ? 'less' : 'css');
+  }
+}
+
+function configureJsxSupport(mode) {
+  if (mode === 'react' || mode === 'react-ts') {
+    // Enable JSX in JavaScript defaults
+    monaco.languages.typescript.javascriptDefaults.setCompilerOptions({
+      target: monaco.languages.typescript.ScriptTarget.ESNext,
+      jsx: monaco.languages.typescript.JsxEmit.React,
+      jsxFactory: 'React.createElement',
+      allowNonTsExtensions: true,
+      allowJs: true,
+    });
+    monaco.languages.typescript.typescriptDefaults.setCompilerOptions({
+      target: monaco.languages.typescript.ScriptTarget.ESNext,
+      jsx: monaco.languages.typescript.JsxEmit.React,
+      jsxFactory: 'React.createElement',
+      allowNonTsExtensions: true,
+    });
+  }
+}
+
+function createEditor(tabDef) {
+  const container = document.createElement('div');
+  container.className = 'editor-container';
+  container.id = `editor-${tabDef.id}`;
+  editorArea().appendChild(container);
+
+  const editor = monaco.editor.create(container, {
+    ...editorOpts,
+    language: tabDef.lang,
+    value: '',
+  });
+
+  if (onChangeCallback) {
+    editor.onDidChangeModelContent(onChangeCallback);
+  }
+
+  return { container, editor };
+}
+
+function renderTabBar(tabs) {
+  const bar = tabBar();
+  bar.innerHTML = '';
+
+  tabs.forEach((tab) => {
+    const btn = document.createElement('button');
+    btn.className = 'tab-btn';
+    btn.dataset.tab = tab.id;
+    btn.textContent = tab.label;
+
+    // Add CSS type selector inside the CSS tab
+    if (tab.id === 'css') {
+      const sel = document.createElement('select');
+      sel.className = 'tab-css-type';
+      sel.id = 'css-type-select';
+      sel.innerHTML = `
+        <option value="css">CSS</option>
+        <option value="scss">SCSS</option>
+        <option value="less">Less</option>
+      `;
+      sel.value = cssType;
+      sel.addEventListener('click', (e) => e.stopPropagation());
+      sel.addEventListener('change', (e) => {
+        cssType = e.target.value;
+        if (editors.css) {
+          const model = editors.css.getModel();
+          monaco.editor.setModelLanguage(model, cssType === 'scss' ? 'scss' : cssType === 'less' ? 'less' : 'css');
+        }
+        if (onChangeCallback) onChangeCallback();
+      });
+      btn.appendChild(sel);
+    }
+
+    btn.addEventListener('click', () => switchTab(tab.id));
+    bar.appendChild(btn);
+  });
+}
+
+export function initEditors(mode = 'html-css-js') {
+  currentMode = mode;
+  const tabs = MODE_TABS[mode];
+
+  configureJsxSupport(mode);
+  renderTabBar(tabs);
+
+  // Create editors for each tab
+  tabs.forEach((tab) => {
+    const { container, editor } = createEditor(tab);
+    editors[tab.id] = editor;
+    editors[`_container_${tab.id}`] = container;
+  });
+
+  // Activate the first tab
+  switchTab(tabs[0].id);
+
+  return editors;
+}
+
+export function switchMode(mode) {
+  if (mode === currentMode) return;
+
+  // Dispose existing editors
+  const oldTabs = MODE_TABS[currentMode];
+  oldTabs.forEach((tab) => {
+    if (editors[tab.id]) {
+      editors[tab.id].dispose();
+    }
+    const container = editors[`_container_${tab.id}`];
+    if (container && container.parentNode) {
+      container.parentNode.removeChild(container);
+    }
+  });
+  editors = {};
+
+  currentMode = mode;
+  const tabs = MODE_TABS[mode];
+
+  configureJsxSupport(mode);
+  renderTabBar(tabs);
+
+  tabs.forEach((tab) => {
+    const { container, editor } = createEditor(tab);
+    editors[tab.id] = editor;
+    editors[`_container_${tab.id}`] = container;
+  });
+
+  switchTab(tabs[0].id);
+}
+
+export function switchTab(tabId) {
+  activeTab = tabId;
+  const tabs = MODE_TABS[currentMode];
+
+  // Update tab button states
+  tabBar().querySelectorAll('.tab-btn').forEach((btn) => {
+    btn.classList.toggle('active', btn.dataset.tab === tabId);
+  });
+
+  // Show/hide editor containers
+  tabs.forEach((tab) => {
+    const container = editors[`_container_${tab.id}`];
+    if (container) {
+      container.classList.toggle('active', tab.id === tabId);
+    }
+  });
+
+  // Trigger layout on the active editor
+  if (editors[tabId]) {
+    editors[tabId].layout();
+    editors[tabId].focus();
+  }
+}
+
+export function getEditorValues() {
+  const values = { html: '', css: '', js: '' };
+  if (editors.html) values.html = editors.html.getValue();
+  if (editors.css) values.css = editors.css.getValue();
+  if (editors.js) values.js = editors.js.getValue();
+  return values;
+}
+
+export function setEditorValues({ html = '', css = '', js = '' }) {
+  if (editors.html) editors.html.setValue(html);
+  if (editors.css) editors.css.setValue(css);
+  if (editors.js) editors.js.setValue(js);
+}
+
+export function getActiveTab() {
+  return activeTab;
+}
diff --git a/public/js/js-preprocessors.js b/public/js/js-preprocessors.js
new file mode 100644
index 0000000..c12c4f1
--- /dev/null
+++ b/public/js/js-preprocessors.js
@@ -0,0 +1,204 @@
+let tsLoaded = false;
+let babelLoaded = false;
+let svelteLoaded = false;
+
+function loadScript(src) {
+  return new Promise((resolve, reject) => {
+    if (document.querySelector(`script[src="${src}"]`)) { resolve(); return; }
+    // Temporarily hide AMD define so UMD scripts register as globals
+    // instead of AMD modules (Monaco's RequireJS sets window.define)
+    const savedDefine = window.define;
+    window.define = undefined;
+    const s = document.createElement('script');
+    s.src = src;
+    s.onload = () => { window.define = savedDefine; resolve(); };
+    s.onerror = () => { window.define = savedDefine; reject(new Error(`Failed to load ${src}`)); };
+    document.head.appendChild(s);
+  });
+}
+
+async function ensureTypeScript() {
+  if (tsLoaded) return;
+  await loadScript('https://cdnjs.cloudflare.com/ajax/libs/typescript/5.6.3/typescript.min.js');
+  if (typeof ts === 'undefined' && typeof window.ts === 'undefined') {
+    await new Promise((resolve) => {
+      const check = setInterval(() => {
+        if (typeof ts !== 'undefined') { clearInterval(check); resolve(); }
+      }, 50);
+    });
+  }
+  tsLoaded = true;
+}
+
+async function ensureBabel() {
+  if (babelLoaded) return;
+  await loadScript('https://cdnjs.cloudflare.com/ajax/libs/babel-standalone/7.26.4/babel.min.js');
+  // Wait for global to be available
+  if (typeof Babel === 'undefined') {
+    await new Promise((resolve) => {
+      const check = setInterval(() => {
+        if (typeof Babel !== 'undefined') { clearInterval(check); resolve(); }
+      }, 50);
+    });
+  }
+  babelLoaded = true;
+}
+
+async function ensureSvelte() {
+  if (svelteLoaded) return;
+  await loadScript('https://unpkg.com/svelte@4.2.19/compiler.cjs');
+  svelteLoaded = true;
+}
+
+/**
+ * Compile JS/TS/JSX/TSX/Vue/Svelte code based on mode.
+ * Returns { js, extraCss?, warnings? }
+ */
+export async function compileJs(code, mode) {
+  if (!code.trim()) return { js: '' };
+
+  switch (mode) {
+    case 'html-css-js':
+      return { js: code };
+
+    case 'typescript':
+      return compileTypeScript(code);
+
+    case 'react':
+      return compileJsx(code);
+
+    case 'react-ts':
+      return compileTsx(code);
+
+    case 'vue':
+      return compileVue(code);
+
+    case 'svelte':
+      return compileSvelte(code);
+
+    default:
+      return { js: code };
+  }
+}
+
+async function compileTypeScript(code) {
+  await ensureTypeScript();
+  const result = ts.transpileModule(code, {
+    compilerOptions: {
+      target: ts.ScriptTarget.ES2020,
+      module: ts.ModuleKind.None,
+      strict: false,
+    },
+  });
+  return { js: result.outputText };
+}
+
+async function compileJsx(code) {
+  await ensureBabel();
+  const result = Babel.transform(code, {
+    presets: ['react'],
+    filename: 'fiddle.jsx',
+  });
+  return { js: result.code };
+}
+
+async function compileTsx(code) {
+  await ensureBabel();
+  const result = Babel.transform(code, {
+    presets: ['react', 'typescript'],
+    filename: 'fiddle.tsx',
+  });
+  return { js: result.code };
+}
+
+function compileVue(code) {
+  // Simple regex-based SFC parser
+  const templateMatch = code.match(/<template>([\s\S]*?)<\/template>/);
+  const scriptMatch = code.match(/<script>([\s\S]*?)<\/script>/);
+  const styleMatch = code.match(/<style(?:\s[^>]*)?>([\s\S]*?)<\/style>/);
+
+  const template = templateMatch ? templateMatch[1].trim() : '<div></div>';
+  const script = scriptMatch ? scriptMatch[1].trim() : '';
+  const extraCss = styleMatch ? styleMatch[1].trim() : '';
+
+  // Build the Vue component + mount code
+  // The user script should export/define component options
+  const js = `
+(function() {
+  ${script}
+
+  // Detect if user defined a component variable
+  var _opts = typeof component !== 'undefined' ? component : {};
+  _opts.template = ${JSON.stringify(template)};
+
+  Vue.createApp(_opts).mount('#app');
+})();
+`;
+
+  return { js, extraCss };
+}
+
+async function compileSvelte(code) {
+  await ensureSvelte();
+  const result = svelte.compile(code, {
+    filename: 'App.svelte',
+    css: 'injected',
+  });
+
+  // Rewrite all svelte imports for browser use via esm.sh
+  // Handles both `import {...} from "svelte/..."` and `import "svelte/..."`
+  let js = result.js.code;
+  js = js.replace(
+    /from\s+["']svelte(\/[^"']*)?["']/g,
+    (_, path) => `from "https://esm.sh/svelte@4${path || ''}"`
+  );
+  js = js.replace(
+    /import\s+["']svelte(\/[^"']*)?["']/g,
+    (_, path) => `import "https://esm.sh/svelte@4${path || ''}"`
+  );
+
+  // Remove the default export and add mount code
+  // The compiled output exports the class as "export default class App ..."
+  // We replace the export to keep it as a local class, then instantiate it
+  js = js.replace(/export default /, '');
+
+  // Add mount code — the class name matches the filename ("App")
+  js += `\n\nnew App({ target: document.getElementById('app') });\n`;
+
+  const warnings = result.warnings ? result.warnings.map((w) => w.message) : [];
+  return { js, warnings, isModule: true };
+}
+
+/**
+ * Get runtime scripts and body HTML to inject into the preview iframe.
+ */
+export function getFrameworkRuntime(mode) {
+  switch (mode) {
+    case 'react':
+    case 'react-ts':
+      return {
+        scripts: [
+          'https://cdnjs.cloudflare.com/ajax/libs/react/18.3.1/umd/react.production.min.js',
+          'https://cdnjs.cloudflare.com/ajax/libs/react-dom/18.3.1/umd/react-dom.production.min.js',
+        ],
+        bodyHtml: '<div id="root"></div>',
+      };
+
+    case 'vue':
+      return {
+        scripts: [
+          'https://cdnjs.cloudflare.com/ajax/libs/vue/3.5.13/vue.global.prod.min.js',
+        ],
+        bodyHtml: '<div id="app"></div>',
+      };
+
+    case 'svelte':
+      return {
+        scripts: [],
+        bodyHtml: '<div id="app"></div>',
+      };
+
+    default:
+      return { scripts: [], bodyHtml: '' };
+  }
+}
diff --git a/public/js/preprocessors.js b/public/js/preprocessors.js
new file mode 100644
index 0000000..7c798e4
--- /dev/null
+++ b/public/js/preprocessors.js
@@ -0,0 +1,54 @@
+let sassLoaded = false;
+let lessLoaded = false;
+
+function loadScript(src) {
+  return new Promise((resolve, reject) => {
+    if (document.querySelector(`script[src="${src}"]`)) { resolve(); return; }
+    const savedDefine = window.define;
+    window.define = undefined;
+    const s = document.createElement('script');
+    s.src = src;
+    s.onload = () => { window.define = savedDefine; resolve(); };
+    s.onerror = () => { window.define = savedDefine; reject(new Error(`Failed to load ${src}`)); };
+    document.head.appendChild(s);
+  });
+}
+
+async function ensureSass() {
+  if (sassLoaded) return;
+  await loadScript('https://cdnjs.cloudflare.com/ajax/libs/sass.js/0.11.1/sass.sync.min.js');
+  sassLoaded = true;
+}
+
+async function ensureLess() {
+  if (lessLoaded) return;
+  window.less = { env: 'production' };
+  await loadScript('https://cdnjs.cloudflare.com/ajax/libs/less.js/4.2.0/less.min.js');
+  lessLoaded = true;
+}
+
+export async function compileCss(code, type) {
+  if (type === 'css') return code;
+
+  if (type === 'scss') {
+    await ensureSass();
+    return new Promise((resolve, reject) => {
+      Sass.compile(code, (result) => {
+        if (result.status === 0) resolve(result.text);
+        else reject(new Error(result.formatted || result.message));
+      });
+    });
+  }
+
+  if (type === 'less') {
+    await ensureLess();
+    try {
+      const result = await less.render(code);
+      return result.css;
+    } catch (e) {
+      throw new Error(e.message);
+    }
+  }
+
+  return code;
+}
diff --git a/public/js/preview.js b/public/js/preview.js
new file mode 100644
index 0000000..78291d7
--- /dev/null
+++ b/public/js/preview.js
@@ -0,0 +1,94 @@
+import { getFrameworkRuntime } from './js-preprocessors.js';
+
+const consoleInterceptor = `
+<script>
+(function() {
+  const methods = ['log', 'warn', 'error', 'info', 'debug', 'clear'];
+  methods.forEach(function(method) {
+    var original = console[method];
+    console[method] = function() {
+      if (method === 'clear') {
+        parent.postMessage({ type: 'console', method: 'clear' }, '*');
+        if (original) original.apply(console, arguments);
+        return;
+      }
+      var args = Array.from(arguments).map(function(a) {
+        if (a === null) return 'null';
+        if (a === undefined) return 'undefined';
+        if (typeof a === 'object') {
+          try { return JSON.stringify(a, null, 2); } catch(e) { return String(a); }
+        }
+        return String(a);
+      });
+      parent.postMessage({ type: 'console', method: method, args: args }, '*');
+      if (original) original.apply(console, arguments);
+    };
+  });
+  window.onerror = function(msg, url, line, col) {
+    parent.postMessage({ type: 'console', method: 'error', args: ['Error: ' + msg + ' (line ' + line + ')'] }, '*');
+  };
+})();
+<\/script>
+`;
+
+/**
+ * Escape </script in user code to prevent premature HTML script tag closing.
+ */
+function escapeScriptClose(code) {
+  return code.replace(/<\/script/gi, '<\\/script');
+}
+
+/**
+ * Build script tags for the preview iframe.
+ * Uses static <script src> tags for runtime libraries (parser-blocking per HTML spec)
+ * followed by an inline <script> for user code.
+ */
+function buildLoaderScript(runtimeUrls, userJs, isModule) {
+  if (isModule) {
+    return `\n<script type="module">\n${escapeScriptClose(userJs)}\n<\/script>`;
+  }
+
+  let parts = '';
+  for (const url of runtimeUrls) {
+    parts += `<script src="${url}"><\/script>\n`;
+  }
+  parts += `<script>\n${escapeScriptClose(userJs)}\n<\/script>`;
+  return parts;
+}
+
+export function renderPreview(html, css, js, mode = 'html-css-js', extraCss = '') {
+  const frame = document.getElementById('preview-frame');
+  const runtime = getFrameworkRuntime(mode);
+
+  // Combine CSS
+  const allCss = extraCss ? `${css}\n${extraCss}` : css;
+
+  // Determine body content
+  let bodyContent;
+  if (mode === 'vue' || mode === 'svelte') {
+    bodyContent = html ? `${html}\n${runtime.bodyHtml}` : runtime.bodyHtml;
+  } else if (runtime.bodyHtml) {
+    bodyContent = `${html}\n${runtime.bodyHtml}`;
+  } else {
+    bodyContent = html;
+  }
+
+  const isModule = mode === 'svelte';
+  const loaderScript = js
+    ? buildLoaderScript(runtime.scripts, js, isModule)
+    : '';
+
+  const doc = `<!DOCTYPE html>
+<html>
+<head>
+<meta charset="UTF-8">
+${consoleInterceptor}
+<style>${allCss}</style>
+</head>
+<body>
+${bodyContent}
+${loaderScript}
+</body>
+</html>`;
+  frame.srcdoc = doc;
+}
diff --git a/server.js b/server.js
new file mode 100644
index 0000000..d50ad00
--- /dev/null
+++ b/server.js
@@ -0,0 +1,48 @@
+import express from 'express';
+import { nanoid } from 'nanoid';
+import { stmts } from './db.js';
+
+const app = express();
+app.use(express.json());
+app.use(express.static('public'));
+
+// API: Create fiddle
+app.post('/api/fiddles', (req, res) => {
+  const id = nanoid(10);
+  const { title = 'Untitled', html = '', css = '', css_type = 'css', js = '', js_type = 'javascript' } = req.body;
+  try {
+    stmts.insert.run({ id, title, html, css, css_type, js, js_type });
+    res.json({ id, title, html, css, css_type, js, js_type });
+  } catch (e) {
+    res.status(500).json({ error: e.message });
+  }
+});
+
+// API: List recent fiddles
+app.get('/api/fiddles', (_req, res) => {
+  res.json(stmts.list.all());
+});
+
+// API: Get fiddle
+app.get('/api/fiddles/:id', (req, res) => {
+  const fiddle = stmts.get.get(req.params.id);
+  if (!fiddle) return res.status(404).json({ error: 'Not found' });
+  res.json(fiddle);
+});
+
+// API: Update fiddle
+app.put('/api/fiddles/:id', (req, res) => {
+  const existing = stmts.get.get(req.params.id);
+  if (!existing) return res.status(404).json({ error: 'Not found' });
+  const { title = existing.title, html = existing.html, css = existing.css, css_type = existing.css_type, js = existing.js, js_type = existing.js_type || 'javascript' } = req.body;
+  stmts.update.run({ id: req.params.id, title, html, css, css_type, js, js_type });
+  res.json({ id: req.params.id, title, html, css, css_type, js, js_type });
+});
+
+// SPA route: serve index.html for /f/:id
+app.get('/f/:id', (_req, res) => {
+  res.sendFile('index.html', { root: 'public' });
+});
+
+const port = process.env.PORT || 3000;
+app.listen(port, () => console.log(`Fiddle server running on http://localhost:${port}`));