Node JS / Generate PDF server side

Question

I need to create PDF files via server side. I have a pug file with the HTML and it's working as expected (the format and the content is perfect). Also, I have a service that gets the HTML from the pug file in a string. The problem is that I'm facing issues using the node-html-pdf library to generate a PDF.

  let config = {
    format: 'Letter',
    orientation: 'portrait',
    type: 'pdf'
  };

 pdf.create(htmlConverted, config).toBuffer((errConvertingHtml, buffer) => {
    if (errConvertingHtml) {
      this.logError(errConvertingHtml, null, `${this.className} createPDF`);
      return this.returnResult(errConvertingHtml, false, null);
    } else {
      const filename = 'Invoice' + '.pdf';
      const base64PDF = buffer.toString('base64');
      const email = new models.EmailModel();
      email.to.email = order.email;
      email.to.name = order.full_name;
      email.template_id = subscriptionTemplate.value;
      email.dynamic_template_data = dynamic_data;
      email.attachments = [
        {
          filename: filename,
          content: base64PDF,
          type: 'application/pdf',
          disposition: 'attachment'
        }
      ];

      let mailIntegration = new integrations.MailIntegration();
      mailIntegration.SendNow(email);
    }
  });

This code works, but the PDF attach in the email doesn't have the right format, it's really small. I can use another library, or another implementation, I don't have any issue with that. Any suggestions or recommendations for this code? I have been searching for another library, but honestly, I haven't found something to convert the HTML string to PDF and then the PDF to a buffer and then to base64. Any help is well received. Thanks, I really appreciate your responses.