Chartjs-Not being able to display value from json data into chart js

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In componentDidMount() you can update state variable chartData as 

this.setState({
   isLoaded: true,
   items: json,
   chartData: {
     labels: symbolsdate,
     datasets: [{...this.state.chartData.datasets, data: closingprice}]
   }
});

Better is to separate dynamic part from static. Store static data like backgroundColor outside of state & provide statically in HTML of render() while, use state variables for dynamic data.

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