https://www.nutrient.io/guides/ios/json/convert-to-xfdf/
Convert Instant JSON to XFDF
Easily convert Instant JSON files to XFDF on iOS while ensuring full compliance with ISO standards.
instant jsonconvertxfdf
https://www.nutrient.io/guides/ios/annotations/introduction-to-annotations/data-formats/
PDF annotation data formats: XFDF vs. JSON
Explore XFDF and Instant JSON formats for managing PDF annotations, their benefits, and how to choose the right one for your needs.
pdf annotationdata formatsxfdfvsjson