PDF Merger Code in JavaScript

Hello,
The following code uses the pdf-merger-js node.js library. You can read more about it here.

1. Create a new folder at your desired location (Folder Name - Merge PDF).
2. Inside this folder, create a new JavaScript file (File Name - mergerCode.js).
3. Open a terminal inside the newly created folder and execute the following command
    npm init
4. Few questions would be asked related to creation of new package. If you don't want to modify anything, follow the prompts. A new package.json file will be created.
5. Edit this package.json file and add "type":"module"
6. Now execute the following command in the terminal
    npm install --save pdf-merger-js
7. Add the code given below in the mergerCode file.
8. Save the file and execute node <fileName.js>

Source Code -
You can add as many PDF files as you want. 
In the parenthesis mention the path/filename of the PDF.

import PDFMerger from "pdf-merger-js";

var merger = new PDFMerger();

(async () =>{

    await merger.add('PDF1.pdf');

    await merger.add('PDF2.pdf');

    //   await merger.add('pdf2.pdf', 2); // merge only page 2

    //   await merger.add('pdf2.pdf', [1, 3]); // merge the pages 1 and 3

    //   await merger.add('pdf2.pdf', '4, 7, 8'); // merge the pages 4, 7 and 8

    //   await merger.add('pdf3.pdf', '3 to 5'); //merge pages 3 to 5 (3,4,5)

    //   await merger.add('pdf3.pdf', '3-5'); //merge pages 3 to 5 (3,4,5)

   

    await merger.save('merged.pdf');

    console.log('PDFs merged');

})();