Read PDF to Text using Google Apps Script Drive V3 Service

function convertPDFToText() {
  const fileId = 'YOUR_PDF_FILE_ID_HERE'; // Replace with your PDF file ID
  const ocrLanguage = 'en'; // Set OCR language to English

  // Convert PDF to Google Doc using OCR
  const pdfBlob = DriveApp.getFileById(fileId).getBlob();
  const doc = Drive.Files.create({
    name: pdfBlob.getName().replace(/\.pdf$/, ''),
    mimeType: MimeType.GOOGLE_DOCS
  }, pdfBlob, {
    ocr: true,
    ocrLanguage: ocrLanguage
  });

  // Extract text and save as a text file
  const text = DocumentApp.openById(doc.id).getBody().getText();
  DriveApp.createFile(doc.name + '.txt', text, MimeType.PLAIN_TEXT);

  // Delete the temporary Google Doc
  DriveApp.getFileById(doc.id).setTrashed(true);

  return text;
}