Create PDF proposals, invoices, contracts etc in Javascript from a suitable Word document template

docx-template-to-pdf.js

// Step 1: generate docx

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, '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, 'output.docx'), buf);

// Step 2: convert docx to pdf

const docx = require("@nativedocuments/docx-wasm");

// init docx engine
docx.init({
    // ND_DEV_ID: "XXXXXXXXXXXXXXXXXXXXXXXXXX",    // goto https://developers.nativedocuments.com/ to get a dev-id/dev-secret
    // ND_DEV_SECRET: "YYYYYYYYYYYYYYYYYYYYYYYYYY", // you can also set the credentials in the enviroment variables
    ENVIRONMENT: "NODE", // required
    LAZY_INIT: true      // if set to false the WASM engine will be initialized right now, usefull pre-caching (like e.g. for AWS lambda)
}).catch( function(e) {
    console.error(e);
});
 
async function convertHelper(document, exportFct) {
    const api = await docx.engine();
    await api.load(document);
    const arrayBuffer = await api[exportFct]();
    await api.close();
    return arrayBuffer;
}
 
convertHelper(buf, "exportPDF").then((arrayBuffer) => {
    fs.writeFileSync("output.pdf", new Uint8Array(arrayBuffer));
}).catch((e) => {
    console.error(e);
});

how could i use your example in a browser (without node)?