var JSZip = require('jszip');
var Docxtemplater = require('docxtemplater');

var fs = require('fs');
var path = require('path');

//Load the docx file as a binary
var content = fs
    .readFileSync(path.resolve(__dirname, 'invoice-template.docx'), 'binary');

var zip = new JSZip(content);

var doc = new Docxtemplater();
doc.loadZip(zip);

//set the templateVariables
doc.setData({CustomerName : "Microsoft Corp",
AddressLine1: "One Microsoft Way",
City: "Redmond",  State: "WA",  Zip: "98052",
Country: "USA",

InvoiceDate : "14 March 2019",
InvoiceNumber: "INV123",
Items: [
{
	Item_Description: "Bananas",
	Item_Price: "5",
	Item_Qty: "10",
	Item_SubTotal: "50"
	},
{
	Item_Description: "Mangoes",
	Item_Price: "10",
	Item_Qty: "4",
	Item_SubTotal: "40"
	}
],
TotalEx:"90",
SalesTax:"9",
Shipping:"10",
TotalPrice:"$109",
DueDate : "28 March 2019"
});

try {
    // render the document ie replace the variables
    doc.render()
}
catch (error) {
    var e = {
        message: error.message,
        name: error.name,
        stack: error.stack,
        properties: error.properties,
    }
    console.log(JSON.stringify({error: e}));
    throw error;
}

var buf = doc.getZip()
             .generate({type: 'nodebuffer'});

// buf is a nodejs buffer, you can either write it to a file or do anything else with it.
fs.writeFileSync(path.resolve(__dirname, 'invoice-instance.docx'), buf);