GoJS is a feature-rich jаvascript library for implementing custom interactive diagrams and complex visualizations across modern web browsers and platforms. GoJS makes constructing jаvascript diagrams of complex nodes, links, and groups easy with customizable templates and layouts. GoJS offers many advanced features for user interactivity such as drag-and-drop, copy-and-paste, in-place text editing, tooltips, context menus, automatic layouts, templates, data binding and models, transactional state and undo management, palettes, overviews, event handlers, commands, and an extensible tool system for custom operations.