Is the code execution sandboxed?

Yes — code runs inside a sandboxed iframe with the sandbox attribute, isolating it from the parent page. This prevents access to the main document's DOM and cookies.

What console methods are captured?

console.log, console.warn, console.error, and console.info are all captured and displayed in the output panel with appropriate styling.

Can I use ES6+ features?

Yes — the playground runs in a modern browser context, so ES6+ features like arrow functions, destructuring, async/await, template literals, and modules via dynamic import() are all available.

Are there pre-built examples?

Yes — four examples are included: Hello World, Array Methods (map/filter/reduce), Async/Await with a simulated fetch, and a Fibonacci generator using recursion.

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JavaScript Playground

Run and test JavaScript code directly in your browser with console output.

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关于此工具

A lightweight JavaScript REPL and playground that lets you write, run, and experiment with JavaScript code directly in the browser. Code runs in an isolated context using a sandboxed iframe so it cannot affect the page. Console.log output, errors, and return values are all displayed in a clean output panel. Choose from pre-loaded examples covering Hello World, array methods, and async patterns. Clear the console, copy your code, and iterate quickly without any setup.

使用方法

1 Type or paste JavaScript code into the editor panel.
2 Click 'Run' or press Ctrl+Enter to execute the code.
3 View console output, return values, and any errors in the output panel.
4 Click an example button to load a pre-built code snippet.
5 Click 'Clear' to reset the output panel, or 'Copy' to copy your code.

关于此工具

使用方法

常见问题