SecureCompiler - Online JavaScript Compiler
Run JavaScript code directly in your browser with our free online JavaScript compiler. Test snippets, debug logic, and experiment with ES6+ features — no setup, no Node.js installation, no account required.
How to Use This Online JavaScript Compiler
Type or paste your JavaScript code into the editor and click Run. Your code is executed in a sandboxed Web Worker inside your browser. console.log() output appears in the terminal panel. The prompt() function works interactively — the terminal will pause and wait for your input. Use Format to auto-indent your code and Share to generate a link.
Modern JavaScript Support
This compiler supports modern JavaScript features including let/const, arrow functions, template literals, destructuring, spread/rest operators, async/await, classes, modules patterns, Array methods (map, filter, reduce), and more. It runs your code using the JavaScript engine built into your browser, so you get full ES6+ support.
Instant Execution
Unlike server-based compilers that send your code to a remote server, this tool runs everything locally in your browser. That means instant execution with zero latency. Your code is completely private — nothing is transmitted over the network.
Great for Quick Testing
Whether you are debugging a function, testing a regex, prototyping an algorithm, or learning JavaScript fundamentals, this compiler gives you a clean environment to work in. The interactive terminal supports prompt() for user input, making it easy to test interactive programs. Works on desktop and mobile browsers.