JavaScript API for PDFs Creation & Conversion

Getting Started with Aspose.PDF for Java

To install and use Aspose.PDF for JavaScript via C++ from a -*ZIP archive, follow the following instructions

• extract the files from the ZIP archive
• encrypt your *.lic file using ‘encrypt_lic.html’
• edit ‘settings.json’ and setup your settings

Follow the link for Direct Download

You can also download the library directly from Aspose.PDF product page

Convert PDF Files via JavaScript API

Portable Document Format (PDF) is a very popular among the internet community and due to its portability, mobility and readability it is considered to be a safe, convenient way to distribute private information through the web. Aspose.PDF for JavaScript via C++ is a very useful tool that helps software developers to convert their PDF documents to other support file formats such as JPEG, PDF and more. With just a couple of steps you can convert PDF files to JPEG file formats as given below.

var ffileToJpg = function (e) {
  const file_reader = new FileReader();
  file_reader.onload = (event) => {
    //convert a PDF file to jpg-files with template "ResultPdfToJpg{0:D2}.jpg" ({0}, {0:D2}, {0:D3}, ... format page number) and save
    const json = AsposePdfPagesToJpg(event.target.result, e.target.files[0].name, "ResultPdfToJpg{0:D2}.jpg");
      if (json.errorCode == 0) {
        document.getElementById('output').textContent = "Files(pages) count: " + json.filesCount.toString();
        //make links to result files
        for (let fileIndex = 0; fileIndex < json.filesCount; fileIndex++) (json.filesNameResult[fileIndex], "mime/type");
      }
      else document.getElementById('output').textContent = json.errorText;
    };
  file_reader.readAsArrayBuffer(e.target.files[0]);
};

Optimize PDF Document via JavaScript API

Aspose.PDF for JavaScript via C++ gives software developers the power to optimize PDF documents content for the Web using JavaScript code. PDF Optimization, or linearization for Web, is a very useful process that helps users in making PDF documents suitable for online browsing using a web browser. Usually it can considerably compress PDF size, boost display speed and make it more appropriate for the user. The following JavaScript example demonstrates how to optimize PDF document suitable for web with just a couple of lines of JavaScript code.

  var ffileOptimize = function (e) {
    const file_reader = new FileReader();
    file_reader.onload = (event) => {
      /*optimize a PDF-file and save the "ResultOptimize.pdf"*/
      const json = AsposePdfOptimize(event.target.result, e.target.files[0].name, "ResultOptimize.pdf");
      if (json.errorCode == 0) document.getElementById('output').textContent = json.fileNameResult;
      else document.getElementById('output').textContent = json.errorText;
      /*make a link to download the result file*/
      DownloadFile(json.fileNameResult, "application/pdf");
    };
    file_reader.readAsArrayBuffer(e.target.files[0]);
  };

Combine PDF Files into Single PDF via JavaScript API

Aspose.PDF for JavaScript via C++ has included very powerful features for PDF manipulation inside Web applications. Software Developers can easily combine multiple PDF documents or Split a large PDF file into multiple PDF documents using JavaScript commands. It is very a very useful process that helps users to combine multiple files into a single one to manage or print it easily. The following JavaScript code example shows how computer programmers can concatenate multiple PDF files with ease.

  var ffileMerge = function (e) {
    const file_reader = new FileReader();
    function readFile(index) {
      /*only two files*/
      if (index >= e.target.files.length || index >= 2) {
        /*merge two PDF-files and save the "ResultMerge.pdf"*/
        const json = AsposePdfMerge2Files(undefined, undefined, e.target.files[0].name, e.target.files[1].name, "ResultMerge.pdf");
        if (json.errorCode == 0) document.getElementById('output').textContent = json.fileNameResult;
        else document.getElementById('output').textContent = json.errorText;
        /*make a link to download the result file*/
        DownloadFile(json.fileNameResult, "application/pdf");
        return;
      }
      const file = e.target.files[index];
      file_reader.onload = function (event) {
        /*prepare(save) file from BLOB*/
        AsposePdfPrepare(event.target.result, file.name);
        readFile(index + 1)
      }
      file_reader.readAsArrayBuffer(file);
    }
    readFile(0);
  }

Extract Text from All Pages of PDF via JavaScript

Aspose.PDF for JavaScript via C++ gives software developers the capability to extract text from PDF documents using JavaScript API. It is a very useful process allowing programmers to get a particular part of a PDF documents and use it in a place where they need it. The library makes it easy for software developers to extract text from PDF images or scanned PDFs without any external dependencies. The following example shows how to get PDF text with just a couple of lines of JavaScript code.

 var ffileExtract = function (e) {
  const file_reader = new FileReader();
    file_reader.onload = (event) => {
      //Extarct text from a PDF-file
      const json = AsposePdfExtractText(event.target.result, e.target.files[0].name);
      if (json.errorCode == 0) document.getElementById('output').textContent = json.extractText;
      else document.getElementById('output').textContent = json.errorText;
    };
  file_reader.readAsArrayBuffer(e.target.files[0]);
};