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parser.parseByTemplate(template); // returns DocumentData or null

const java = require('java');
const groupdocs = require('@groupdocs/groupdocs.parser');

function rect(x, y, width, height) {
  return new groupdocs.Rectangle(new groupdocs.Point(x, y), new groupdocs.Size(width, height));
}

function fixedField(x, y, width, height, name) {
  return new groupdocs.TemplateField(new groupdocs.TemplateFixedPosition(rect(x, y, width, height)), name);
}

function linkedField(linkedFieldName, name) {
  // The value is located to the right of the linked field
  const edges = new groupdocs.TemplateLinkedPositionEdges(false, false, true, false);
  return new groupdocs.TemplateField(
    new groupdocs.TemplateLinkedPosition(linkedFieldName, new groupdocs.Size(200, 15), edges), name);
}

function getTemplate() {
  // Create detector parameters for "Details" table
  const detailsTableParameters = new groupdocs.TemplateTableParameters(rect(35, 320, 530, 55), null);
  // Create detector parameters for "Summary" table
  const summaryTableParameters = new groupdocs.TemplateTableParameters(rect(330, 385, 220, 65), null);
  // Create a collection of template items
  const templateItems = [
    fixedField(35, 135, 100, 10, 'FromCompany'),
    fixedField(35, 150, 100, 35, 'FromAddress'),
    fixedField(35, 190, 150, 2, 'FromEmail'),
    fixedField(35, 250, 100, 2, 'ToCompany'),
    fixedField(35, 260, 100, 15, 'ToAddress'),
    fixedField(35, 290, 150, 2, 'ToEmail'),
    new groupdocs.TemplateField(new groupdocs.TemplateRegexPosition('Invoice Number'), 'InvoiceNumber'),
    linkedField('InvoiceNumber', 'InvoiceNumberValue'),
    new groupdocs.TemplateField(new groupdocs.TemplateRegexPosition('Order Number'), 'InvoiceOrder'),
    linkedField('InvoiceOrder', 'InvoiceOrderValue'),
    new groupdocs.TemplateField(new groupdocs.TemplateRegexPosition('Invoice Date'), 'InvoiceDate'),
    linkedField('InvoiceDate', 'InvoiceDateValue'),
    new groupdocs.TemplateField(new groupdocs.TemplateRegexPosition('Due Date'), 'DueDate'),
    linkedField('DueDate', 'DueDateValue'),
    new groupdocs.TemplateField(new groupdocs.TemplateRegexPosition('Total Due'), 'TotalDue'),
    linkedField('TotalDue', 'TotalDueValue'),
    new groupdocs.TemplateTable(detailsTableParameters, 'details', null),
    new groupdocs.TemplateTable(summaryTableParameters, 'summary', null),
  ];
  // Create a document template
  const items = new (java.import('java.util.ArrayList'))();
  templateItems.forEach((item) => items.add(item));
  return new groupdocs.Template(items);
}

// Create an instance of Parser class
const parser = new groupdocs.Parser('invoice.pdf');
try {
  // Parse the document by the template
  const data = parser.parseByTemplate(getTemplate());
  // Check if parsing by template is supported
  if (data === null) {
    console.log("Parse Document by Template isn't supported.");
  } else {
    // Print extracted fields
    for (let i = 0; i < data.getCount(); i++) {
      const field = data.get(i);
      const area = field.getPageArea();
      // Check if the field value is a text area
      const isTextArea = area !== null && java.instanceOf(area, 'com.groupdocs.parser.data.PageTextArea');
      console.log(`${field.getName()}: ${isTextArea ? area.getText() : 'Not a template field'}`);
    }
  }
} finally {
  parser.close();
}

process.exit(0);

FROMCOMPANY: DEMO - Sliced Invoices
FROMADDRESS: Suite 5A-1204
123 Somewhere Street
Your City AZ 12345
FROMEMAIL: admin@slicedinvoices.com
...
INVOICENUMBERVALUE: INV-3337
...
TOTALDUEVALUE: $93.50
DETAILS: Not a template field
SUMMARY: Not a template field