PdfAnnotationExportSettings API in JavaScript PDF API control

// Load an existing PDF document
let document: PdfDocument = new PdfDocument(data, password);
// Sets export data format as JSON type to annotation export settings
let settings: PdfAnnotationExportSettings = new PdfAnnotationExportSettings();
// Set the data format defined in annotation export settings
settings.dataFormat = DataFormat.json;
// Export annotations to JSON format
let json: Uint8Array = document.exportAnnotations(settings);
// Save the document
document.save('output.pdf');
// Destroy the document
document.destroy();