How to create a chart in pdf and excel using node js?

JavaScript function to create the line chart:

function TyLyReport() {
            var lineChartData = {
                labels : ["Jan","Feb","Mar"],
                datasets : [
                    {
                        label: 'Dataset 1',
                        borderColor: 'rgba(75, 192, 192, 1)',
                        backgroundColor: 'rgba(75, 192, 192, 0.2)',
                        data : [1000, 2000, 2500],
                        fill: false
                    },
                    {
                        label: 'Dataset 2',
                        borderColor: '#FF4848',
                        backgroundColor: 'rgba(255, 72, 72, 0.2)',
                        data : [1016, 1800, 2900],
                        fill: false
                    }
                ]
            };

            var ctx = document.getElementById("canvas").getContext("2d");
            window.myLine = new Chart(ctx, {
                type: 'line',
                data: lineChartData,
                options: {
                    responsive : true,
                    scales: {
                        yAxes: [{
                            ticks: {
                                beginAtZero: true
                            }
                        }]
                    }
                }
            });

            // Export chart image to Excel
            exportToExcel();
        }
 // Function to export chart image to Excel
        function exportToExcel() {
            var canvas = document.getElementById("canvas");
            var image = canvas.toDataURL("image/png");

            var workbook = new ExcelJS.Workbook();
            var worksheet = workbook.addWorksheet('Chart Image');
            var imageId = workbook.addImage({
                base64: image,
                extension: 'png',
            });
            worksheet.addImage(imageId, 'A1');

            workbook.xlsx.writeBuffer().then(function(buffer) {
                saveAs(new Blob([buffer]), 'chart_image.xlsx');
            });
        }

        // Call the TyLyReport function when the window loads
        window.onload = TyLyReport;

By using the above code, I can able to download the excel and export the chart image seperately but image is not created inside the excel. Can anyone please guide me to export inside the excel. I need to export image in excel like the below image

I am not sure what exactly happens in the code you posted, since the library versions that are used are not specified. It's possible that it actually works, but the image is hardly visible, very small, confined to one cell (A1) and transparent.

In order to be initially visible, the image should be given width and height values, so I adopted the solution in the "Add an image to a cell".

Since it was not specified in the question, I used the latest versions of all libraries; chart.js v4 required some alterations to the configuration object. It also required that the animation is disabled; an alternative would have been to set the exporting of the image after the animation has ended, using the onComplete handler.

I also added, if needed, the standard plugin solution for a colour-filled (white) background, since the default transparent one might not be adequate.

Here it is, the modified version:

function TyLyReport() {
    var lineChartData = {
        labels : ["Jan","Feb","Mar"],
        datasets : [
            {
                label: 'Dataset 1',
                borderColor: 'rgba(75, 192, 192, 1)',
                backgroundColor: 'rgba(75, 192, 192, 0.2)',
                data : [1000, 2000, 2500],
                fill: false
            },
            {
                label: 'Dataset 2',
                borderColor: '#FF4848',
                backgroundColor: 'rgba(255, 72, 72, 0.2)',
                data : [1016, 1800, 2900],
                fill: false
            }
        ]
    };

    var ctx = document.getElementById("canvas").getContext("2d");
    new Chart(ctx, {
        type: 'line',
        data: lineChartData,
        options: {
            responsive : true,
            animation: false,
            scales: {
                y: {
                    beginAtZero: true
                }
            }
        },
        plugins:[
            {
                beforeDraw(chart){ // White background in the exported image
                    const {ctx, canvas} = chart;
                    ctx.save();
                    ctx.fillStyle = '#FFF';
                    ctx.fillRect(0, 0, canvas.offsetWidth, canvas.offsetHeight);
                    ctx.restore();
                }
            }
        ]
    });

    // Export chart image to Excel
    exportToExcel();
}

// Function to export chart image to Excel
function exportToExcel() {
    const canvas = document.getElementById("canvas");
    const image = canvas.toDataURL("image/png").split(';base64,')[1];
    // see https://stackoverflow.com/a/63494628/16466946 (not required)

    const workbook = new ExcelJS.Workbook();
    const worksheet = workbook.addWorksheet('Chart Image');
    const imageId = workbook.addImage({
        base64: image,
        extension: 'png',
    });
    worksheet.addImage(imageId,
        {
            tl: { col: 0, row: 0 },
            ext: { width: canvas.offsetWidth, height: canvas.offsetHeight}
        }
    );

    workbook.xlsx.writeBuffer().then(function(buffer) {
        saveAs(new Blob([buffer]), 'chart_image.xlsx');
    });
}

TyLyReport();

<div style="min-height: 60vh">
    <canvas id="canvas" style="background-color: #fff">
    </canvas>
</div>
<script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/4.4.1/chart.umd.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/exceljs/4.4.0/exceljs.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/FileSaver.js/2.0.5/FileSaver.min.js"></script>

The snippet seems to have disabled the download popup; here it is working, in a jsFiddle.