API Reference > imodeljs-frontend > IModelApp > IModelApp > startup startup MethodStatic This method must be called before any iModel.js frontend services are used. In your code, somewhere before you use any iModel.js services, call IModelApp.startup. E.g.: IModelApp.startup( {applicationId: myAppId, i18n: myi18Opts} ); startup(opts?: IModelAppOptions): Promise<void> Parameter Type Description opts IModelAppOptions The options for configuring IModelApp Returns - Promise<void> Defined in core/frontend/src/IModelApp.ts Line 326 Last Updated: 29 November, 2022