Get supported features Leave feedback

The set of the supported features depends on the document format. GroupDocs.Parser provides the functionality to check if a feature is supported for the document. The getFeatures() method of the Parser class is used for this purpose.

The Features class has the following members:

Here are the steps to check if a feature is supported:

• Instantiate the Parser object for the initial document;
• Call the corresponding method of the object returned by getFeatures() to check if the feature is supported.

The following example shows how to check if the text extraction feature is supported:

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

// Create an instance of Parser class
const parser = new groupdocs.Parser('sample.zip');
try {
  // Check if text extraction is supported for the document
  if (!parser.getFeatures().isText()) {
    console.log("Text extraction isn't supported");
  } else {
    // Extract a text from the document
    const reader = parser.getText();
    try {
      console.log(reader.readToEnd());
    } finally {
      reader.close();
    }
  }
} finally {
  parser.close();
}

process.exit(0);

If the feature isn’t supported, the method returns null instead of the value. So if checking of Features is omitted, the result is checked for null:

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

// Create an instance of Parser class
const parser = new groupdocs.Parser('sample.zip');
try {
  // Extract a text into the reader
  const reader = parser.getText();
  // If text extraction isn't supported, a reader is null
  if (reader === null) {
    console.log("Text extraction isn't supported");
  } else {
    try {
      console.log(reader.readToEnd());
    } finally {
      reader.close();
    }
  }
} finally {
  parser.close();
}

process.exit(0);

Both examples print “Text extraction isn’t supported” because there is no text in a ZIP archive.

Some operations may consume significant time, so it’s not optimal to call the method just to check whether the feature is supported. Use getFeatures() for this purpose.

To learn more about document data extraction features and get familiar how to extract text, images, forms and more, please refer to the advanced usage section.

Along with the full-featured library we provide simple, but powerful free Apps.

You are welcome to extract data from PDF, DOC, DOCX, PPT, PPTX, XLS, XLSX, Emails and more with our free online Free Online Document Parser App.