Government-style form filling

Programmatic form filling with schema validation.

Tax forms, visa applications, benefits claims. SnapPDF fills the original PDF (no re-drawing), validates field names, and returns the diff so nothing gets missed.

Operations used

Example workflow

1. 01
   User completes form on your web UI

   You already have their data.
2. 02
   SnapPDF fill-form

   Values JSON → PDF fields by name.
3. 03
   Diff unknown fields

   Response lists `unknown` so you catch typos.
4. 04
   SnapPDF sign

   Draw the user’s captured signature.
5. 05
   SnapPDF protect + download

   Final artifact to download or file.

Code

const r = await snap.pdf.fillForm({
  file: officialFormPdf,
  values: userAnswers,
  flatten: false, // keep editable for human review
});
if (r.unknown && r.unknown.length > 0) {
  throw new Error(`Form schema changed — unknown fields: ${r.unknown.join(',')}`);
}

Best for

Other use cases