What is the JavaScript Playground?
The StackInterview JavaScript Playground is a free, browser-based code editor that lets you write, run, and debug ES6+ JavaScript instantly — no installation, no account, and no backend required. Powered by Monaco Editor (the same engine behind VS Code), it gives you a professional editing experience with syntax highlighting, autocomplete, and live error detection. Code executes in an isolated sandbox, so you can experiment safely without any risk to your environment.
Key Features
The same editor that powers VS Code — syntax highlighting, autocomplete, and error detection built in.
Your code runs directly in the browser. No server round-trip, no delays.
Captures console.log, console.error, console.warn, and runtime exceptions with clear color coding.
No account required. No install. Just open the page and start writing JavaScript.
Supported ES6+ Features
Use Cases
Quick Prototyping
Test an idea or verify a snippet without spinning up a project.
Interview Prep
Practice JavaScript algorithms and data structures hands-on.
Learning ES6
Experiment with modern syntax and see results immediately.