Best library to convert React components to PNG/PDF?

Question

I have implemented a react web app which creates charts using Chart.js library. Now I want to convert this charts to PNG/PDF formats and save them. I came across a lot of libraries but facing some or the other issue with them. Can you suggest which library would be perfect for this kind of work ?

App.js

class CreateChart extends Component {
// call to get chartData object
    render() {
        return (
          <div className="App">
            <header className="App-header">
              REACT CHARTS
            </header>
                <CreateChart chartData={this.state.chartData} />
          </div>
        );
      }
}

Chart.js

class CreateChart extends Component {
    componentDidMount() {
            this.myChart = new Chart(
                this.chartRef.current,
                this.props.chartData
            );
    }
    
    render() {
           return <canvas ref={this.chartRef} />
    }
}

Answer 1

I suggest you to add an id on your html element (let's say topdf ) :

render() { return <canvas id="topdf" ref={this.chartRef} /> }}.

Then you can use the html2canvas library to get the image dataURI of your charts. After that, you can use the jsPDF library to make a document and use the .addImage(your_image_data_URI) function.

Exemple :

html2canvas(document.querySelector("#topdf"), { 
      scale: 3, // use the desired scale
      allowTaint: true,
      useCORS: true
    }).then(canvas => { 

      // Your IMAGE_DATA_URI
      var imgData = canvas.toDataURL('image/jpeg');

      // Make pdf
      var doc = new jsPDF({ options });

      // add image
      doc.addImage(imgData, 'JPEG');

      // Save document
      doc.save('charts.pdf'); 

      // ....

This only work onInit runtime, or after runtime.