JavaScript Sandbox

Test any JavaScript snippet instantly, in a safe space.

A free online JavaScript sandbox with live preview, npm packages, and a real console. Paste a snippet, try a library, reproduce a bug - it all runs in your browser, isolated and nothing to install. No signup required. Trusted by 1.1M+ developers.

Open Sandbox

No credit card required · Free to use

or download desktop client for

Mac Windows Linux

1.1M+

Users

2.7M+

Projects Created

2016

Since

TRUSTED BY

About this tool

One of Playcode's coding tools

This sandbox is one of the coding tools Playcode supports, free in your browser. Playcode's main product today helps you build and run websites and apps with AI: describe what you need, and the agent builds it, publishes it, and changes it when you ask. What is Playcode

Open AI Website Builder

Built for Everyone

Whether you're learning JavaScript or building production apps, this playground has you covered

For Beginners

Learn JavaScript without installing anything. Write code, see results instantly. Perfect JavaScript playground for beginners who want to start coding immediately.

No downloads, no configuration, no command line. This free JavaScript sandbox runs entirely in your browser. Follow along with tutorials and see your code execute in real-time. Perfect online JavaScript playground for learning to code.

✓Zero setup required - just open and code
✓Built-in tutorials for learning JavaScript
✓Instant feedback with live preview
✓Helpful error messages and debugging

Best for: Students, coding bootcamps, JavaScript learners, online courses

For Professionals

Prototype faster with AI-powered code generation. Import npm packages instantly, build with React/Vue/TypeScript, and publish to production with one click.

This online JavaScript playground gives you the power of a full IDE without the setup time. AI understands your project context and writes complete features, not just autocomplete suggestions. The best JS playground for rapid prototyping.

✓AI coding assistant writes working code
✓Access 2M+ npm packages instantly
✓TypeScript, JSX, and ES2026 support
✓One-click deployment to custom domains
✓Multi-file projects with hot reload

Best for: Senior developers, prototyping, MVPs, client demos, rapid testing

For Teams

Collaborate in real-time with your team. Conduct live coding interviews, pair program, or teach workshops. Multiple developers can edit the same JavaScript playground simultaneously.

This online code playground supports real-time collaboration out of the box. Share a URL and start coding together. Perfect for technical interviews, pair programming, and remote teams. The best JavaScript sandbox for collaborative coding.

✓Real-time collaborative editing
✓Live cursors and selections
✓Share via URL - no account required
✓Perfect for coding interviews
✓Team workspaces for organization

Best for: Technical interviews, pair programming, code reviews, teaching, remote teams

All JavaScript Frameworks Supported

Build with React, Vue, Angular, Svelte, TypeScript, or vanilla JavaScript. Style with Tailwind CSS, Bootstrap, or any CSS framework. Our JS playground comes pre-configured with all tooling.

React·Vue·Angular·TypeScript·Tailwind·HTML

Beyond JavaScript: Multi-Language Support

Playcode's coding tools started with a JavaScript playground and now cover Python, C++, C, Go, SQL, and more. Each compiler runs code directly in your browser with instant feedback.

Python Compiler·C++ Compiler·C Compiler·Go Compiler·JavaScript Compiler

Free Developer Tools

Beyond our JavaScript playground, we offer productivity tools for developers. All free, all in your browser. No signup required.

JSON Formatter·JSON Diff·JSON to TypeScript·Regex Tester·HTML Runner

New to JavaScript?

Start with these beginner-friendly tutorials

letVariables "A"Data Types fnFunctions +Operators >_Console { }Scope asyncAsync =>Types //Comments ( )Params

Get on Board

Quick Start from a Template. Start instantly using pre-made templates. Over 2 million NPM packages available from the start. React, Vue, Lodash, RxJs, p5.js, Three.js and more.

See Result as You Type. Experience the fastest coding experience ever with Playcode. Instantly observe the results as you type.

Debug in Console. Enhance your speed and debugging skills rapidly using Playcode's efficient platform.

Live collaboration is built-in. Conduct coding interviews or create together with others from anywhere in the world, on any device.

          
            // Task 1: Sum of All Elements in an Array
// Example:
console.log(sumArray([1, 2, 3, 4])); // 10

          
            // Hmm... Let me try
function sumArray(arr) {
    return arr.reduce((acc, curr) => acc + curr, 0);
}

// That's a really elegant solution!

Deploy and Share your Project. Make your projects live with just one click. With zero setup and custom domains, sharing your web apps with the world has never been simpler.

.playcode.io

Online Playgrounds & Compilers

Write, compile, and run code instantly in your browser. No setup required.

AI Website Builder

Build sites with AI

JavaScript Compiler

Compile & run JS instantly

Python Compiler

Compile Python online

React Playground

Build React apps online

TypeScript Playground

Write TypeScript online

Vue Playground

Build Vue.js apps online

Tailwind Playground

Design with Tailwind CSS

Features

Code Autocomplete. Enhance your coding speed and efficiency with smart code autocomplete feature. Avoid checking the documentation frequently.

Bug Finder. Playcode can identify and display all errors, providing assistance to fix them. Write, run code, correct any errors quickly.

The Most Flexible Layout.

Arrange panels as you like.

Upload Assets. Images, videos, sounds, shaders and others.

Color Themes.

Feels great in any environment.

Ready to use
JavaScript Playground

No need to configure your own IDE preset, start immediately.

Open Playground

Code seamlessly from any device

Jumping from your Mac to your iPad to your iPhone is no problem. Web editor is optimized for all devices.

Frequently Asked Questions

Everything you need to know about the JavaScript Sandbox

What is a JavaScript sandbox?

A JavaScript sandbox is an isolated online environment where you can run and test JavaScript code without affecting anything else. Playcode's JavaScript Sandbox is a free browser-based coding tool: paste a snippet, import npm packages, and see the result instantly. Nothing installs on your machine, so you can experiment freely.

Is it safe to run untrusted code in the sandbox?

Playcode runs your JavaScript inside your own browser tab, isolated from your operating system and files. It is a convenient way to try snippets from tutorials, Stack Overflow, or AI assistants before using them in a real project. As with any code, review what you run - the sandbox executes it as written.

Can I test npm packages in the sandbox?

Yes. Import any of over 2 million npm packages - React, Vue, Lodash, Axios, date-fns - and Playcode fetches and bundles them automatically. No npm install, no package.json to configure. It is the fastest way to try a library before adding it to your codebase.

Do I need to sign up to use the sandbox?

No signup required. Open Playcode and start testing JavaScript immediately. Create a free account only if you want to save sandboxes and open them across devices.

Can I share my sandbox with someone?

Every sandbox gets a unique playcode.io URL. Share it and anyone can open your code, run it, and fork their own copy - perfect for reproducing a bug, asking for help, or reviewing a snippet together.

Does the JavaScript sandbox work on mobile?

Yes. The sandbox runs in any modern browser with a touch-friendly, responsive layout, so you can test JavaScript on a phone or tablet. Native desktop apps for Mac, Windows, and Linux are also available.

What our users value

No coding needed

Results in minutes

Works on phone

Built my landing page in 20 minutes.

I described what I wanted and watched it build in real-time. No coding, no templates, just conversation. The AI understood exactly what I meant. My landing page looks professional and I published it the same day. This is how website building should work.

- Sarah Mitchell

Ready to Build Something?