JS Bin

JS Bin is an open-source collaborative JavaScript debugging and code sharing tool that allows developers to write and test HTML, CSS, and JavaScript in a browser-based editor with live output rendering. It was one of the earliest online code playgrounds and remains widely used for rapid prototyping, debugging, and sharing code snippets with colleagues or on community forums. The interface separates HTML, CSS, JavaScript, and output into four resizable panels, supporting CSS preprocessors like LESS and SCSS, JavaScript libraries loaded via CDN, and console output logging. Users can save bins to unique URLs for sharing, clone existing bins as starting templates, and register for account features including revision history and private bins. A built-in console panel captures errors and log output from executed JavaScript, helping debug without opening browser DevTools. The project is fully open source, running on Node.js.