File download from express

server.js

const express = require("express");
const PDF = require("pdfkit");
const PizZip = require("pizzip");
const Docxtemplater = require("docxtemplater");
const fs = require("fs");
const path = require("path");

const server = express();

server.get("/mypdf", async (req, res, next) => {
  try {
    const doc = new PDF();
    doc.text("Hello, World!");
    doc.pipe(res);
    doc.end();
  } catch (e) {
    next(e);
  }
});

server.get("/myword", async (req, res, next) => {
  try {
    // Load the docx file as binary content
    const content = fs.readFileSync(
      path.resolve(__dirname, "input.docx"),
      "binary"
    );

    const zip = new PizZip(content);

    const doc = new Docxtemplater(zip, {
      paragraphLoop: true,
      linebreaks: true,
    });

    // Render the document (Replace {first_name} by John, {last_name} by Doe, ...)
    doc.render({
      first_name: "John",
      last_name: "Doe",
      phone: "0652455478",
      description: "New Website",
    });

    const buf = doc.getZip().generate({
      type: "nodebuffer",
      // compression: DEFLATE adds a compression step.
      // For a 50MB output document, expect 500ms additional CPU time
      compression: "DEFLATE",
    });

    res.setHeader("Content-Type", "application/octet-stream");
    res.setHeader("Content-Disposition", 'attachment; filename="word.docx"');
    res.send(buf);
  } catch (e) {
    next(e);
  }
});

server.listen(5000, () => {
  console.log("Listening to 5000");
});