ExpressJS Endpoint to generate PDF's using PDFKit library.

pdfController.js

const PDFDocument = require("pdfkit");

const generatePDF = async (info, doc) => {
  doc
    .font("Times-Roman")
    .fontSize(12)
    .text(info.title);
};

module.exports = {
  generatePDF
};

pdfHandler.js

const express = require("express");
const router = express.Router();
const PDFDocument = require("pdfkit");
const pdfController = require("../controllers/pdfController");

router.post("/", async (request, response) => {
  try {
    const doc = new PDFDocument({ bufferPages: true });
    let buffers = [];
    doc.on("data", buffers.push.bind(buffers));
    doc.on("end", () => {
      let pdfData = Buffer.concat(buffers);
      response
        .writeHead(200, {
          "Content-Length": Buffer.byteLength(pdfData),
          "Content-Type": "application/pdf",
          "Content-disposition": "attachment;filename=report.pdf"
        })// it responses with the PDF file download.
        .end(pdfData);
    });
    pdfController.generatePDF(request.body, doc); // Here you send the data for the PDF Document and the blank PDF Buffer.
    doc.end();
  } catch (error) {
    response.status(400).json({ message: error.message, code: error.code });
  }
});