/pdf-merger-js

Primary LanguageJavaScriptMIT LicenseMIT

Description

This node.js library can merge multiple PDF documents, or parts of them, to one new PDF document. It's only dependency is pdfjs so it can run in any javascript-only environnement without any external dependencies.

This library is inspired by the PHP library PDFMerger and has a very similar API.

Installation

npm install --save pdf-merger-js

Code sample

const PDFMerger = require('pdf-merger-js');

var merger = new PDFMerger();

(async () => {
  merger.add('pdf1.pdf');  //merge all pages. parameter is the path to file and filename.
  merger.add('pdf2.pdf', [2]); // merge only page 2
  merger.add('pdf2.pdf', [1, 3]); // merge the pages 1 and 3
  merger.add('pdf2.pdf', '4, 7, 8'); // merge the pages 4, 7 and 8
  merger.add('pdf3.pdf', '1 to 2'); //merge pages 1 to 2
  merger.add('pdf3.pdf', '3-4'); //merge pages 3 to 4

  await merger.save('merged.pdf'); //save under given name and reset the internal document
})();

Browser Sample - React

import PDFMerger from 'pdf-merger-js/browser';
import React, { useEffect, useState } from 'react';

// files: Array of PDF File or Blob objects
const Merger = (files) => {
  const [mergedPdfUrl, setMergedPdfUrl] = useState();

  useEffect(() => {
    const render = async () => {
      const merger = new PDFMerger();

      for(const file of files) {
        await merger.add(file)
      }

      const mergedPdf = await merger.saveAsBlob();
      const url = URL.createObjectURL(mergedPdf);

      return setMergedPdfUrl(url);
    };

    render().catch((err) => {
      throw err;
    });

    () => setMergedPdfUrl({});
  }, [files, setMergedPdfUrl]);

  return !data ? (
    <>Loading</>
  ) : (
    <iframe
      height={1000}
      src={`${mergedPdfUrl}`}
      title='pdf-viewer'
      width='100%s'
    ></iframe>
  );
};

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