Generate charts inside xlsx doc with node

index.js

var express = require('express');
var bodyParser = require('body-parser');
var app = express();
var fs = require("fs");


//===================================
var XLSXChart = require("xlsx-chart");
var xlsxChart = new XLSXChart();
var opts = {
    chart: "radar",
    titles: [
        "Price"
    ],
    fields: [
        "Contract & Contractor Management",
        "Quality Management in Construction",
        "CSV & Sustainability",
        "Logistic Management",
        "Safety & Environmental",
        "Operative Construction Management"
    ],
    data: {
        "Price": {
            "Contract & Contractor Management": 5,
            "Quality Management in Construction": 53,
            "CSV & Sustainability": 95,
            "Logistic Management": 15,
            "Safety & Environmental": 40,
            "Operative Construction Management": 50
        }
    },
    chartTitle: "HPO ENEL"
};

//====================================================================

app.use(bodyParser.json({
    limit: '50mb'
})); // parse application/vnd.api+json as json
app.use(bodyParser.urlencoded({
    limit: '50mb',
    extended: true,
    parameterLimit: 50000
})); // parse application/x-www-form-urlencoded


app.use(function (req, res, next) {
    res.header("Access-Control-Allow-Origin", "*");
    res.header('Access-Control-Allow-Methods', 'GET,PUT,POST,DELETE,OPTIONS');
    res.header("Access-Control-Allow-Headers", "Origin, X-Requested-With, Content-Type, Accept");
    next();
});

app.set('port', process.env.PORT || 4000);


var server = app.listen(app.get('port'), function () {
    console.log('Express server listening on port ' + server.address().port);
    xlsxChart.generate(opts, function (err, data) {
        var filename = "radar_"+Date.now()+".xlsx";
        if (err) {
            console.error(err);
        } else {
            fs.writeFileSync(filename, data);
            console.log(filename+" created.");
        };
    });
});