You can dispatch an action in componentDidMount() method and in render() method you can verify the data.
componentDidMount()
render()
class App extends Component { componentDidMount() { this.props.fetchData() } render() { return this.props.isLoaded ? <div>{'Loaded'}</div> : <div>{'Not Loaded'}</div> } } const mapStateToProps = (state) => ({ isLoaded: state.isLoaded }) const mapDispatchToProps = { fetchData } export default connect(mapStateToProps, mapDispatchToProps)(App)