Node.js

mkdir dspdf-node-demo
cd dspdf-node-demo
npm init -y

npm install @mescius/ds-pdf

// node-pdf-example.mjs
// Example: Generate a PDF file in Node.js using @mescius/ds-pdf (ESM + npm)

import fs from "fs";
import path from "path";
import { fileURLToPath } from "url";

// Import required DsPdfJS APIs
import { connectDsPdf, DsPdfConfig, ObjectManager, PdfDocument } from "@mescius/ds-pdf";

// Resolve the current file and directory (ESM replacement for __dirname)
const __filename = fileURLToPath(import.meta.url);
const __dirname = path.dirname(__filename);

// Configure the absolute path to the DsPdf.wasm file.
// In Node.js, you must explicitly provide the path to the WASM binary.
const wasmPath = path.resolve(
  __dirname,
  "node_modules/@mescius/ds-pdf/assets/DsPdf.wasm"
);
DsPdfConfig.wasmUrl = wasmPath;

// Main function that creates and saves a PDF document
async function createPdf() {
  console.log("🚀 Starting PDF generation in Node.js...");

  // Initialize the DsPdfJS runtime (loads and connects to the WASM module)
  const connected = await connectDsPdf();
  if (!connected) {
    throw new Error("Failed to initialize DsPdfJS.");
  }

  // Create an ObjectManager instance (required for managing PDF resources)
  const om = new ObjectManager();

  try {
    // Create a new PDF document
    const doc = new PdfDocument(om);

    // Create a new page context for drawing content
    const page = doc.newPageContext();

    // Draw text on the page at coordinates (x: 50, y: 50)
    page.drawText(
      {
        text: "Hello from Node.js!",
        fontSize: 18,
        foreColor: "DarkBlue"
      },
      50,
      50
    );

    // Save the PDF and obtain the binary data
    const pdfData = doc.savePdf();

    // Convert ArrayBuffer to a Node.js Buffer
    const buffer = Buffer.from(pdfData.buffer || pdfData);

    // Write the PDF file to disk
    fs.writeFileSync("node-example.pdf", buffer);

    console.log("✅ node-example.pdf created successfully!");
  } finally {
    // Always dispose ObjectManager to release WASM resources
    om.dispose();
  }
}

// Execute the PDF generation function
createPdf().catch(console.error);

node node-pdf-example.mjs

🚀 Starting PDF generation in Node.js...
✅ node-example.pdf created successfully!

Hello from Node.js!

dspdf-node-demo/
├── node_modules/
├── package.json
├── package-lock.json
└── node-pdf-example.mjs