The best way to get docxtemplater is via npm

npm install docxtemplater --save

jszip version 2 is important !**, it won't work with version 3

npm install jszip@2 --save

Then create "input.docx" file containing "Hello {firstname} {lastname} !"

And create the following index.js file:

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

var content = fs
    .readFileSync(__dirname+"/input.docx","binary");

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

doc.setData({
    "firstname":"John",
    "lastname":"Doe"
});

doc.render();

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

fs.writeFileSync(__dirname+"/output.docx",buf);

And that's it! docxtemplater will replace all keys passed to setData inside the input docx

To get started in the browser, view the quickstart in the browser