Cloud - Create a PDF using NodeJs via API

This example shows how to generate a PDF from a DOCX template using Node.JS.  It calls the Docmosis REST API to merge the data with the template and stream the result back.

The sample code includes the instructions to get started. You will need a Free Trial and then plug your Docmosis Cloud access key into the code below, then run.

Note: This code sample is written to specifically work with DWS4.

// This Node.js example calls the Docmosis web service to create a PDF document
// from the default template (samples/WelcomeTemplate.docx).
// To run:
//  1) plug your Docmosis access key into the accessKey variable
//  2) Make sure your you have the correct region specified in the hostname variable
// Copyright Docmosis 2019

import * as https from "https";
import * as fs from "fs";

// Set your access key here. This is visible in your cloud account in the Docmosis Web Site.
// It is your key to accessing your service - keep it private and safe.
const accessKey = "XXXXX";

// RESTful service host. Set your region here.
// End-point in the USA
const hostname = "";
// End-point in the EU
//const hostname = "";
// End-point in AUS
//const hostname = "";

// make sure the access key above has been set
if (accessKey == "XXXXX") {
    console.log("Please set your access key in this example");

// The template to use
// NOTE that it has to be defined in your account with the same name specified here
const template = "samples/WelcomeTemplate.docx"; // Change with your actual template name

// The output file name and extension
const output = "myWelcome.pdf";

// The data to use for generating the document
const data = {
    title:"Welcome to Docmosis in the Cloud",
        {"msg":"This cloud experience is better than I thought."},
        {"msg":"The sun is shining."},
        {"msg":"Right, now back to work."}

const postData = new URLSearchParams({

const options = {
    hostname: hostname,
    port: 443,
    path: "/api/render",
    method: "POST",
    headers: {
        "Content-Type": "application/x-www-form-urlencoded",
        "Content-Length": Buffer.byteLength(postData)

const req = https.request(options, (res) => {
    switch (res.statusCode) {
    case 200:
        var file = fs.createWriteStream(output);

        // feed response into file
        file.on("finish", () => {
            console.log(output, "created");
        // 4XX errors - client errors - something needs to be corrected in the request
        // 5XX errors - server side errors - possibly worth a retry

        // show error response (details)
        console.log("Error response:", res.statusCode, res.statusMessage);
        var response = "";
        res.on("data", (data) => {
            response += data;
        res.on("end", () => {

req.on("error", (e) => {
    console.error("Request error:", JSON.stringify(e, null, 4));

// write data to request body


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API Overview

Docmosis offers a high-performance, template-based PDF generation API. Suitable for use with custom software applications built using Java, C#/.Net, Python, Ruby and more. See a side-by-side comparison of the API for our SaaS and self-hosted products.