Free JavaScript Playground — Run JavaScript Code Online Securely
Run JavaScript code in a secure sandboxed environment. Test code snippets, debug JavaScript, and see console output instantly. Syntax highlighting, code editor, and comprehensive security measures included.
Secure Sandboxed Execution
Code runs in an isolated Web Worker environment with dangerous APIs blocked for your safety.
Real-Time Console Output
See console.log, errors, and execution results instantly with formatted, color-coded output.
Dual Mode Editor
Choose between simple textarea or advanced code editor with syntax highlighting and auto-indentation.
Secure Code Execution
Run JavaScript code safely in an isolated Web Worker — dangerous APIs are blocked automatically.
Real-Time Console Output
See console.log, errors, warnings, and execution results with formatted, color-coded output.
Syntax Highlighting
Advanced code editor with JavaScript syntax highlighting, auto-indentation, and line numbers.
Execution Timeout
Automatic 5-second timeout prevents infinite loops and resource exhaustion.
Free Forever
No signup, no hidden limits — always 100% free to use for testing and learning JavaScript.
Privacy First
All code execution happens locally in your browser — your code never leaves your device.