Free JavaScript Compiler with Live Execution — runs in your browser

JavaScript Editor
Copy
Console
Click "Run Code" to execute your javascript code...
Try an example:

Pick an example, then press Ctrl/⌘ + Enter or click Run Code. Code runs 100% in your browser — nothing is sent to a server.

Online JavaScript Editor with Live Execution

Write, run and test JavaScript directly in your browser — no installation, no sign-up, and nothing sent to a server. Code executes in your browser's own JavaScript engine and the output from console.log and console.error appears instantly in the console panel. It's perfect for learning JavaScript, testing a snippet, prototyping logic, or preparing for coding interviews.

Features

  • ✅ Instant execution — run JS in your browser with real console output
  • ✅ Modern ES6+ — arrow functions, destructuring, classes, async/await, Map/Set
  • ✅ Monaco editor — syntax highlighting, autocomplete and error hints
  • ✅ Keyboard shortcut — press Ctrl/⌘ + Enter to run
  • ✅ 100% private — your code never leaves your browser
  • ✅ Free, no signup — works entirely client-side

How to use

  1. Write or paste your JavaScript in the editor, or pick an example.
  2. Press Ctrl/⌘ + Enter or click Run Code.
  3. Read the result — console output and any errors show in the console panel.

Good to know

This editor runs browser JavaScript, so Node.js-only APIs such as require, fs and process aren't available — it's built for language features, algorithms and data manipulation. The last expression's value is shown alongside anything you log, and thrown exceptions are reported with their message so you can debug quickly.