API Reference > imodeljs-frontend > IModelConnection > IModelConnection > isClosed isClosed AccessorAbstractReadOnly Check if the IModelConnection is closed (i.e. it has no connection to a backend server). Returns true for BlankConnection instances and after IModelConnection.close has been called. isClosed: boolean note no RPC operations are valid on this IModelConnection if this method returns true. Returns - boolean Defined in core/frontend/src/IModelConnection.ts Line 141 Last Updated: 29 November, 2022