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Extract data from PDF forms using Flutter

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Nutrient Flutter SDK allows you to extract data from form fields programmatically. Each form field has a fully qualified name, which is used to identify and retrieve a specific form field object before extracting its data.

Obtaining the fully qualified name of a form field

The example below shows how to obtain the fully qualified name of the first form field on the first page of a document:

dynamic allAnnotations = await pdfDocument.getAnnotations(0, 'all');
// Get the fully qualified name for the first form field.
String? formFieldName = (allAnnotations[0]['formFieldName']);

Getting the data from a form field

The example below shows how to get the data from a form field with the fully qualified name, formFieldName:

// Get the data from a form field with the fully qualified name, `formFieldName`.
String? lastName = await pdfDocument.getFormFieldValue('formFieldName');

Getting form field properties

You can also get the properties of a form field using the getFormFields method from the PdfDocument(opens in a new tab) class. This method returns a list of FormField objects, and each field contains the most common properties for the form field. This can be useful for validating form fields and extracting additional data from them:

List<FormField> formFields = await pdfdocument.getFormFields();


for (FormField formField in formFields) {
  print('Field name: ${formField.name}');
  print('Field readOnly: ${formField.isReadOnly}');
  print('Field required: ${formField.isRequired}');
  ...
}