Extract Text from PDF using JavaScript

Extract Text From all the Pages of PDF Document

Extracting text from PDF isn’t easy. Not many PDF readers can extract text from PDF images or scanned PDFs. But Aspose.PDF for JavaScript via C++ tool allows you to easily extract text from all PDF file.

Check the code snippet and follow the steps to extract text from your PDF:

1. Select a PDF file to extract text.
2. Create a ‘FileReader’ is to read the text.
3. The AsposePdfExtractText function is executed.
4. Next, if the ‘json.errorCode’ is 0, then the ‘json.extractText’ will contain the extracted content. If the ‘json.errorCode’ parameter is not equal to 0 and, accordingly, your file will have an error, then information about such an error will be contained in the ‘json.errorText’.
5. As a result, you will receive a string with the extracted text from your PDF.

    var ffileExtract = function (e) {
      const file_reader = new FileReader();
      file_reader.onload = (event) => {
        /*Extract 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]);
    };

Using Web Workers

    /*Create Web Worker*/
    const AsposePDFWebWorker = new Worker("AsposePDFforJS.js");
    AsposePDFWebWorker.onerror = evt => console.log(`Error from Web Worker: ${evt.message}`);
    AsposePDFWebWorker.onmessage = evt => document.getElementById('output').textContent = 
      (evt.data == 'ready') ? 'loaded!' :
        (evt.data.json.errorCode == 0) ?
          evt.data.json.extractText :
          `Error: ${evt.data.json.errorText}`; 

    /*Event handler*/
    const ffileExtract = e => {
      const file_reader = new FileReader();
      file_reader.onload = event => {
        /*Extract text from a PDF-file - Ask Web Worker*/
        AsposePDFWebWorker.postMessage(
          { "operation": 'AsposePdfExtractText', "params": [event.target.result, e.target.files[0].name] },
          [event.target.result]
        );
      };
      file_reader.readAsArrayBuffer(e.target.files[0]);
    };