JavaScript Compiler Online

The only JavaScript compiler with AI coding assistant.

Compile JS, TypeScript, JSX instantly. Real-time errors, npm packages, one-click publish. Used by 11 million developers.

Files

main.js

Console

PressCtrl+Enteror click Run to execute code

1.1M+

Developers

23M+

Projects Created

2016

Since

TRUSTED BY *

* registered email accounts from associated companies

The Most Powerful Online JavaScript Compiler

PlayCode's JavaScript compiler is trusted by over 11 million developers worldwide. Compile, run, and test your JavaScript code instantly in your browser with zero setup, no installation, and no waiting. Whether you're learning JavaScript, building prototypes, or debugging complex algorithms, our online JS compiler provides everything you need.

Unlike traditional desktop compilers, PlayCode runs entirely in your browser using cutting-edge WebAssembly technology. This means you can compile JavaScript from any device, anywhere in the world, with just an internet connection.

What is a JavaScript Compiler?

A JavaScript compiler transforms your source code into optimized, executable JavaScript that runs in the browser. Unlike traditional compilers that produce machine code, JS compilers perform several important tasks: they bundle your code, resolve module imports, and transpile modern syntax (ES2024, TypeScript, JSX) into browser-compatible JavaScript.

PlayCode's online JavaScript compiler handles all of this automatically. You write modern JavaScript, TypeScript, or JSX code, and our compiler instantly transforms it into code that runs in any browser. There's no need to configure Babel, Webpack, or any other build tools.

For a sandbox experience with live preview, try our JavaScript Playground.

Compile JavaScript, TypeScript, and JSX

Our JavaScript compiler supports the latest ECMAScript 2024 features, TypeScript with full type checking, and JSX/TSX for React development. Write code using optional chaining, nullish coalescing, top-level await, and all the modern syntax you love.

JavaScript ES2024

Latest ECMAScript features including modules, async/await, and decorators.

TypeScript

Full type checking, interfaces, generics, and IntelliSense support.

JSX & TSX

Build React components with JSX syntax and TypeScript type safety.

Need TypeScript specifically? Check out our dedicated TypeScript Playground or React Playground.

AI-Powered JavaScript Development

PlayCode is the only JavaScript compiler with a built-in AI coding assistant. Describe what you want to build, and watch AI write the code for you. Fix bugs, refactor code, and learn JavaScript faster with your AI coding partner.

The AI understands your entire project context, not just the current file. It can modify multiple files, suggest improvements, and help you understand complex code. Whether you're a beginner learning JavaScript or an experienced developer prototyping ideas, AI assistance accelerates your workflow.

Want AI to build entire websites? Try our AI Website Builder.

Full npm Package Support

Import any npm package with a single line of code. Our JavaScript compiler fetches and bundles packages automatically from the npm registry. No npm install command needed, no node_modules folder, no package.json configuration.

Popular packages like React, Vue, Lodash, Axios, Day.js, and over 2 million other npm packages work out of the box. Our intelligent caching system makes subsequent imports instant, so you can experiment with different libraries without waiting.

import React from'react';
import _ from'lodash';
import axios from'axios';

Use Cases for Online JavaScript Compilers

Learning JavaScript

Perfect for beginners who want to learn JavaScript without setting up a local development environment. See your code run instantly and understand how JavaScript works.

Rapid Prototyping

Quickly test ideas and build prototypes without the overhead of creating a new project. Import npm packages, build UI components, and iterate fast.

Code Testing & Debugging

Test code snippets, debug algorithms, and experiment with new JavaScript features. Our console shows detailed output including execution time.

Technical Interviews

Conduct live coding interviews with real-time collaboration. Multiple users can edit and see changes simultaneously.

Teaching & Education

Share code examples with students via simple URLs. No software installation required for students to run and modify code.

Why Choose PlayCode's JavaScript Compiler?

⚡

Lightning Fast

Compilation in 20-50ms. Faster than local Node.js bundlers.

🤖

AI Assistant

The only compiler with built-in AI coding help.

📦

2M+ npm Packages

Import any package with zero configuration.

🌐

One-Click Publish

Deploy to live URL instantly with custom domains.

👥

Real-Time Collaboration

Code together with your team in real-time.

📱

Works Everywhere

Desktop, tablet, phone, any device.

How to Use Our JavaScript Compiler

Write JavaScript Code Instantly. No setup, no installation required. Open your browser and start writing JavaScript, TypeScript, or JSX code immediately. Choose from pre-made templates or start from scratch.

Compile JavaScript in Real-Time. Our JavaScript compiler processes your code instantly as you type. See compilation results immediately with zero delay. No build step, no waiting.

Debug with Powerful Console. Our JavaScript compiler includes a professional console for debugging. See console.log outputs, errors, and warnings instantly. Track execution time and catch bugs quickly.

Compile TypeScript & JSX. Our JavaScript compiler supports TypeScript, JSX, and TSX out of the box. Write modern code with full type checking and React components. No configuration needed.

          
            // TypeScript with type checking
interface User {
  name: string;
  age: number;
}

          
            // JSX with React components
const App = () => (
  <div>Hello, World!</div>
);

// Compiled successfully in 23ms

Publish Your Compiled Code. Deploy your JavaScript project to a live URL with one click. No server setup, no hosting configuration. Connect custom domains and share your compiled code with the world.

Publish JavaScript compiler projects to live URL — Deploy and publish compiled JavaScript code to a live website with custom domain

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.

Start coding

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

What is a JavaScript compiler?

A JavaScript compiler transforms your JavaScript code into optimized, executable code. Unlike traditional compilers that produce machine code, JS compilers like PlayCode bundle your code, resolve imports, and transpile modern syntax (ES2026, TypeScript, JSX) into browser-compatible JavaScript that runs instantly.

Is PlayCode's JavaScript compiler free?

Yes, PlayCode's JavaScript compiler is completely free to use. You can compile and run unlimited JavaScript code, use npm packages, and see live preview results without paying anything. Pro features like AI assistance and private projects are available for subscribers.

Can I use npm packages in the online compiler?

Yes! PlayCode supports the entire npm ecosystem. Just import any package like React, Vue, Lodash, or Axios, and our compiler fetches and bundles it automatically. No npm install needed. Our intelligent caching makes subsequent imports instant.

How does the AI coding assistant help?

PlayCode's AI assistant can write code, fix bugs, explain errors, and help you learn JavaScript. Just describe what you want to build, and the AI generates working code. It understands your project context and can modify multiple files. Unlike basic autocomplete, it's a full coding agent.

Does the JavaScript compiler work offline?

PlayCode works offline once loaded. The compiler runs entirely in your browser using WebAssembly, so you can keep coding without an internet connection. Your code is saved locally and syncs when you're back online.

What languages does PlayCode compile?

PlayCode compiles JavaScript (ES2026), TypeScript, JSX, TSX, and CSS. You can build React, Vue, Svelte, and vanilla JS projects. The compiler handles all transpilation automatically, so you write modern code and it just works in any browser.

How fast is the online JavaScript compiler?

PlayCode's compiler is optimized for speed. Initial compilation takes 100-500ms depending on project size. Incremental builds (when you edit code) complete in 20-50ms. That's often faster than running a local Node.js bundler because everything runs in memory with no disk I/O.

Can I publish my project to a live website?

Yes! PlayCode lets you publish your project to a live URL with one click. No deployment setup, no hosting provider, no server configuration. You can even connect your own custom domain to create a full production website. PlayCode handles hosting, SSL certificates, and CDN automatically.

Does PlayCode support real-time collaboration?

Yes, PlayCode supports real-time collaboration. Multiple developers can edit the same project simultaneously, seeing each other changes in real-time. Everything is auto-saved to the cloud, so you never lose your work. Perfect for pair programming and teaching.

What our users value

Easy to use

Fast

Best for learners

Best online JavaScript compiler

I've tried every online JS compiler out there. PlayCode is the only one that actually feels like a real IDE. The Monaco editor, instant preview, and npm support make it perfect for quick prototyping.

- Alex Chen, Frontend Developer