API Reference > imodeljs-frontend > IModelConnection > IModelConnection > isOpen isOpen AccessorReadOnly Check if the IModelConnection is open (i.e. it has a connection to a backend server). Returns false for BlankConnection instances and after IModelConnection.close has been called. isOpen: boolean note no RPC operations are valid on this IModelConnection if this method returns false. Returns - boolean Defined in core/frontend/src/IModelConnection.ts Line 135 Last Updated: 29 November, 2022