Ace is a standalone code editor written in JavaScript that can be embedded in any web page or application.
Ace addresses the need for a capable browser-based code editor by providing syntax highlighting for over 120 languages, support for multiple themes, and editor features like code folding, multiple cursors, search and replace with regular expressions, and customizable key bindings including vim and Emacs modes. The editor handles large documents efficiently and offers live syntax checking for several languages. It was developed as the primary editor for Cloud9 IDE and succeeds the Mozilla Skywriter project.
Developers should choose Ace when they need to embed a code editor directly into a web application rather than building one from scratch. It suits projects requiring syntax highlighting across many languages, with the ability to import TextMate and Sublime syntax definitions and themes. The tool works as a textarea replacement through a bookmarklet and can be integrated either by copying pre-packaged builds or by using requireJS to load modules. Configuration is straightforward, requiring only a sized DOM element and basic JavaScript setup to initialize an editor instance.
The project maintains active discussion channels for user questions and provides comprehensive API documentation alongside a kitchen sink demo application showing integration patterns. Development activity shows consistent engagement with the codebase through ongoing refinement of editor capabilities and language support.
