How to get an image of the highcharts chart in node.js?

Question

With highcharts, we have a built-in button to download the current chart (example: http://www.highcharts.com/demo/, this button: arrow). We can save it as PNG, JPEG, PDF or SVG.

Instead of downloading it on client side i want to download image on server and sent that image to particular user through email How could I do that using Node.js ?

I got this solution, but getting TypeError: chartExporter.export is not a function:-

const fs = require("fs");
const chartExporter = require("highcharts-export-server");

chartExporter.initPool();

let chartOptions = highchart chart option

chartExporter.export({
    type: "svg",
    outfile: "./output-file.svg",
    options: chartOptions
}, (err, res) => {
    console.log(`The chart has been succesfully generated as SVG at ${res.filename}!`);

    chartExporter.killPool();
});

How to resolve this issue or anyone has any other solution to fulfil my requirement

**

Note :- Below solution is working for me but got this error when i try to get image second time

**

Answer 1

I think you got some wrong documentation the name of function is startExport Please try the code below

const exporter = require('highcharts-export-server');
const fs = require('fs')
const path = require('path')

async function run() {
    const data = {
        categories: ['Jan', 'Feb', 'Mar', 'Apr', 'May'],
        series: [{
            name: 'Los Angeles',
            data: [6, 7, 7, 7, 6]
        },{
            name: 'London',
            data: [3, 4, 3, 4, 3]
        }]
    };

    const exportSettings = {
        export: {
            type: 'png',
            options: {
                chart: {
                    type: 'line'
                },
                title: {
                    text: 'My Chart'
                },
                xAxis: {
                    categories: data.categories
                },
                yAxis: {
                    title: {
                        text: 'Temperature (°C)'
                    }
                },
                series: data.series
            }
        }
    };

    const options = exporter.setOptions(exportSettings);

    await exporter.initPool(options);

    exporter.startExport(exportSettings, function (res, err) {
        if (err) {
            console.error('Error in exporting chart:', err);
            return;
        }
        const binaryData = Buffer.from(res.data, 'base64');
        exporter.killPool();

        const savepath = path.join(__dirname, './', 'output.png')
        fs.writeFile(savepath, binaryData, (err) => {
            if (err) {
                console.error('Error in writing to image file:', err);
                return;
            }
            console.log('File written successfully.');
        });
    });
}

run()

UPDATE:

To prevent log creation you can set the logging level to 0 in the options object (result of setOptions)

    const options = exporter.setOptions(exportSettings);
    options.logging.level = 0

Regarding the tmp folder, it is used by highcharts-export-server to keep the temp files and resources generated during processing but unfortunately the package does not offer a way to change the location of tmp folder as of now (although a pending PR is there in the official github repo so keep an eye on it)