Importing & exporting data from PDF forms
Form data can be saved and loaded the same way as annotations through XFDF data.

Please see import/export annotations to learn more.
All of the form field data (field values and widget appearances) is included inside XFDF, for example when calling annotManager.exportAnnotations.
Learn more
A short introduction to XFDF file format An introduction to XFDF file format
Importing and exporting annotations To import and export annotation and forms data through XFDF data.
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