How to Build Interactive Code Playgrounds with Sandpack (2026 Edition)

Recently it was announced that Sandpack will no longer be actively maintained. Not really great news to wake up to, but C'est la vie. I personally was introduced to Sandpack when going through the blog of Josh W. Comeau (https://www.joshwcomeau.com/).

If you've ever used the React documentation or seen a blog post where you can edit code and see a live preview instantly, you've likely seen Sandpack in action.

Even though CodeSandbox has recently pivoted toward AI infrastructure, Sandpack remains one of the best ways to embed an interactive coding experience into your website. In this guide, we'll walk through how to set it up, what you need to know about its current status, and whether it's still the right choice for your project.

What is Sandpack?

Sandpack is an open-source component toolkit that brings the power of the CodeSandbox bundler directly to your React app. It allows you to:

• Provide live-running code examples

• Support multiple frameworks (React, Vue, Svelte, Vanilla JS)

• Custom-style the editor to match your brand

• Run entirely in the browser without server dependencies

The Maintenance Situation: What You Need to Know

Today which is 18th March 2026 08:54 IST got a mail that clearly marks that SandPack will no longer be actively maintained.

What Still Works:

• All existing functionality remains stable

• The bundler is battle-tested and production-ready

• Community contributions are still accepted

• No breaking changes are expected

What to Consider:

• New framework versions may not be immediately supported

• Security patches will likely be community-driven

• Feature requests will depend on community contributions

Bottom Line: For documentation sites, blogs, and educational content in 2026, Sandpack is still reliable. For mission-critical enterprise applications requiring guaranteed support, you might want alternatives.

Getting Started

First, install the package. It's lightweight and easy to drop into any React project.

npm install @codesandbox/sandpack-react

Bundle Size: significantly smaller than Monaco Editor or full IDE solutions.
https://bundlephobia.com/package/@codesandbox/sandpack-react@2.20.0

https://bundlephobia.com/package/monaco-editor

Your First Playground

The simplest way to use Sandpack is the <Sandpack /> preset. This gives you a code editor and a preview window in one go.

import { Sandpack } from "@codesandbox/sandpack-react";

export default function MyBlog() {
  return (
    <Sandpack 
      template="react" 
      theme="dark" // or "light", "amethyst", "github-light"
    />
  );
}

Customizing Your Code

You don't usually want a blank template; you want to show your code. You can pass a files object to define the starting state.

<Sandpack
  files={{
    "/App.js": `export default function App() {
  return <h1>Hello from my blog!</h1>
}`,
    "/styles.css": "h1 { color: purple; }",
  }}
  template="react"
/>

Pro Tips for Better UX

To make your blog post or documentation feel truly professional, try these settings:

A. Show the File Explorer

If your example has multiple files, let the user see them.

<Sandpack
  files={{ /* your files */ }}
  options={{
    showTabs: true,
    showLineNumbers: true, 
    editorHeight: 400,
    showNavigator: true, // File explorer
  }}
/>

B. Add Dependencies

Need to show how to use a library like framer-motion or lodash (not really) ? Just add it to the customSetup.

<Sandpack
  customSetup={{
    dependencies: {
      "framer-motion": "latest",
      "date-fns": "^2.30.0", // You can specify versions
    },
  }}
/>

C. Use "Read-Only" Files

Sometimes you want users to play with App.js but keep the utility files hidden or uneditable.

<Sandpack 
 files={{
    "/App.js": `import { secret } from './Utils';
export default function App() {
  return <h1>The answer is {secret}</h1>
}`, // code content
 "/Utils.js": {
      code: "export const secret = 42;",
      readOnly: true,
      hidden: true,
    },
  }}

/>

D. Set Active File

Control which file opens by default:

<Sandpack 
options={{ activeFile: "/App.js", // This file will be visible on load
visibleFiles: ["/App.js", "/styles.css"], // Only show these tabs }} 
/>

Real-World Use Cases

1. Technical Blog Posts Perfect for demonstrating React hooks, state management patterns, or API integrations with live, editable examples.

2. Component Library Documentation Show your UI components in action with customizable props that readers can modify in real-time.

3. Educational Content Interactive tutorials where students can experiment with code directly in the lesson.

4. API Documentation Demonstrate API calls with live examples that developers can test immediately.

5. Code Review & Collaboration Share reproducible code snippets with teammates without creating full repositories.

Common Pitfalls & Solutions

Mistake: Large Initial Files

<Sandpack
  files={{
    "/App.js": veryLargeCodeString, // 1000+ lines
  }}
/> 

Solution: Split Code or Lazy Load

<Sandpack 
files={{ 
"/App.js": mainComponent, 
"/helpers.js": { code: utilities, hidden: true },
 }}
options={{ 
activeFile:"/App.js", 
visibleFiles: ["/App.js"], // Hide heavy files initially 
}} 
/>

Future-Proofing Your Implementation

Since Sandpack is no longer actively maintained, here's how to protect your investment:

1. Version Pinning

{ "dependencies": { "@codesandbox/sandpack-react": "2.13.5" 
// Don't use ^ or ~ 
} }

Complete Example: Production-Ready Blog Playground

Here's a complete, production-ready example with all best practices:

import { Sandpack } from "@codesandbox/sandpack-react";

export default function ProductionSandpack() {
  return (
    <Sandpack
      template="react"
      theme="github-light"
      files={{
     "/App.js": `import { useState } from 'react';
import './styles.css';

export default function Counter() {
  const [count, setCount] = useState(0);
  
  return (
    <div className="counter">
      <h1>Count: {count}</h1>
      <button onClick={() => setCount(count + 1)}>
        Increment
      </button>
      <button onClick={() => setCount(0)}>
        Reset
      </button>
    </div>
  );
}`,
        "/styles.css": `.counter {
  font-family: sans-serif;
  text-align: center;
  padding: 2rem;
}

button {
  margin: 0.5rem;
  padding: 0.5rem 1rem;
  font-size: 1rem;
  cursor: pointer;
  background: #61dafb;
  border: none;
  border-radius: 4px;
}

button:hover {
  background: #4fa8c5;
}`,
      }}
      options={{
        showLineNumbers: true,
        showInlineErrors: true,
        editorHeight: 400,
        showNavigator: false,
        showTabs: true,
        closableTabs: false,
        activeFile: "/App.js",
      }}
      customSetup={{
        dependencies: {
          "react": "^18.2.0",
          "react-dom": "^18.2.0"
        },
      }}
    />
  );
}

Conclusion

Despite no longer being actively maintained, Sandpack remains one of the most elegant solutions for embedding code playgrounds in 2026. Its small bundle size, zero configuration setup, and beautiful defaults make it perfect for:

• Documentation sites

• Technical blogs

• Educational content

• Component showcases

For these use cases, Sandpack is still the most developer-friendly option available.

However, if you need cutting-edge features, enterprise support, or server-side capabilities, exploring alternatives like StackBlitz WebContainers might be worth the added complexity.

The key is understanding your requirements and choosing the tool that best fits your specific needs.

Resources

• Sandpack Documentation

• GitHub Repository

• Josh W. Comeau's Blog - Great real-world examples

• StackBlitz WebContainers - Alternative for Node.js support

• Monaco Editor - If you need just the editor