Combine and Merge PDF files into One Online using Node.js

Combine_and_Merge_PDF_files_using_NodeJs_Merger.js

// How to Merge and Combine PDF files into One using Node.js
const combine = async () => {

let documentApi = groupdocs_merger_cloud.DocumentApi.fromKeys(clientId, clientSecret);

// create first join item
let item1 = new groupdocs_merger_cloud.JoinItem();
item1.fileInfo = new groupdocs_merger_cloud.FileInfo();
item1.fileInfo.filePath = "nodejs-testing/sample-file1.pdf";

// create second join item
let item2 = new groupdocs_merger_cloud.JoinItem();
item2.fileInfo = new groupdocs_merger_cloud.FileInfo();
item2.fileInfo.filePath = "nodejs-testing/sample-file2.pdf";

// create join options
let options = new groupdocs_merger_cloud.JoinOptions();
options.joinItems = [item1, item2];
options.outputPath = "nodejs-testing/joined-file.pdf";

  try {
    // Create join documents request
    let joinRequest = new groupdocs_merger_cloud.JoinRequest(options);
    let result = await documentApi.join(joinRequest);
  } 
  catch (err) {
    throw err;
  }
}

combine()
.then(() => {
  console.log("Successfully combined PDF documents: ");
})
.catch((err) => {
  console.log("Error occurred while merging the PDF files:", err);
})

Combine_and_Merge_PDF_files_using_NodeJs_Merger.md

You can combine multiple PDF files into a single PDF file programmatically on the cloud. In this article, you will learn how to merge PDF files into One PDF file using Node.js.

The following topics shall be covered in this article:

1. Online Document Merger REST API and Node.js SDK
2. Merge and Combine PDF files into One using Node.js
3. How to Merge Multiple PDF files Pages in Node.js
4. Upload and Download PDF file using Cloud Storage

Combine_Specific_PDF_files_using_NodeJs_Merger.js

// How to Merge Multiple PDF files Pages in Node.js
const mergespecific = async () => {

  // Merge PDFs api initialization
  let documentApi = groupdocs_merger_cloud.DocumentApi.fromKeys(clientId, clientSecret);

  // create first join item
  let item1 = new groupdocs_merger_cloud.JoinItem();
  item1.fileInfo = new groupdocs_merger_cloud.FileInfo();
  item1.fileInfo.filePath = "nodejs-testing/sample-file1.pdf";
  item1.pages = [1, 3];

  // create second join item
  let item2 = new groupdocs_merger_cloud.JoinItem();
  item2.fileInfo = new groupdocs_merger_cloud.FileInfo();
  item2.fileInfo.filePath = "nodejs-testing/sample-file2.pdf";
  item2.startPageNumber = 2
  item2.endPageNumber = 4

  // create join options
  let options = new groupdocs_merger_cloud.JoinOptions();
  options.joinItems = [item1, item2];
  options.outputPath = "nodejs-testing/joined-file.pdf";

  try {
    // Create join documents request
    let joinRequest = new groupdocs_merger_cloud.JoinRequest(options);
    let result = await documentApi.join(joinRequest);
  } 
  catch (err) {
    throw err;
  }
}

mergespecific()
.then(() => {
  console.log("Successfully merged PDF documents specific pages: ");
})
.catch((err) => {
  console.log("Error occurred while combining the PDF files:", err);
})

Download_Merge_PDF_file_using_NodeJs_Merger.js

// construct FileApi to download merged file
var fileApi = groupdocs_merger_cloud.FileApi.fromConfig(config);
// create donwload file request
let request = new groupdocs_merger_cloud.DownloadFileRequest("nodejs-testing/joined-file.pdf", myStorage);
// download file and response type Stream
fileApi.downloadFile(request)
    .then(function (response) {
        // save file in your system directory
        fs.writeFile("H:\\groupdocs-cloud-data\\joined-file.pdf", response, "binary", function (err) { });
        console.log("Expected response type is Stream: " + response.length);
    })
    .catch(function (error) {
        console.log("Error: " + error.message);
    });

Upload_to_Merge_PDF_files_using_NodeJs_Merger.js

// construct FileApi
let fileApi = groupdocs_merger_cloud.FileApi.fromConfig(config);
// open file in IOStream from your system drive.
let resourcesFolder = 'H:\\groupdocs-cloud-data\\sample-pdf\\';

fs.readdir(resourcesFolder, (err, files) => {
  files.forEach(file => {
    // read files one by one
    fs.readFile(resourcesFolder + file, (err, fileStream) => {
      // create upload file request
      let request = new groupdocs_merger_cloud.UploadFileRequest("nodejs-testing/" + file, fileStream, myStorage);
      // upload file
      fileApi.uploadFile(request)
        .then(function (response) {
          console.log(file + " file uploaded: " + response.uploaded.length);
        })
        .catch(function (error) {
          console.log("Error: " + error.message);
        });
    });
  });
});

Utils_to_Merge_Multiple_PDF_files_using_NodeJs_Merger.js

# Import Node.js SDK in your node application from http://api.groupdocs.cloud
global.groupdocs_merger_cloud = require("groupdocs-merger-cloud");
global.fs = require("fs");

// get clientId and clientSecret from https://dashboard.groupdocs.cloud (free registration is required).
global.clientId = "xxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx";
global.clientSecret = "xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx";
global.myStorage = "test-internal-storage";
const config = new groupdocs_merger_cloud.Configuration(clientId, clientSecret);
config.apiBaseUrl = "https://api.groupdocs.cloud";