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Extract FDF data from a PDF

Only available with the Full API

To extract data from PDF to FDF, then export FDF as XFDF

const doc = await PDFNet.PDFDoc.createFromURL(filename);

// Extract form fields data to FDF.
// Optionally use e_both to extract both forms and annotations
const doc_fields = doc.fdfExtract(PDFNet.PDFDoc.ExtractFlag.e_forms_only);
doc_fields.setPDFFileName(filename);
const fields_buf = doc_fields.saveMemoryBuffer();
saveAs(new Blob([fields_buf], {type: 'text/plain'}), output_fdf_filename);

// Export form fields data from FDF to XFDF.
const xfdf_data = doc_fields.saveAsXFDFAsString();
saveAs(new Blob([xfdf_data], {type: 'application/xml'}), output_xfdf_filename);

PDF Form Fill and Form Data Extraction
Full sample code which illustrates basic FDF merge/extract functionality and full support for FDF (Forms Data Format)

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