Metadata And Custom Data

Set standard metadata in the constructor or with info, and add custom Info dictionary values with info({ ReportId: "Q1-2026" }) or custom("ReportId", "Q1-2026"). Both custom-entry spellings match Wasm; the last call for a given custom key wins. Custom keys belong in method calls, not constructor options.

var pdfDoc = new Recipe("new", "output.pdf", {
  author: "Example Co.",
  title: "Quarterly Report",
  subject: "Q1",
  keywords: ["q1", "report"],
});

pdfDoc.custom("ReportId", "Q1-2026").createPage().endPage().endPDF();

For an existing document, info() without arguments reads current metadata; info(options) queues updates for finalization. structure(path) writes a debugging view of an opened source PDF.

To add metadata to a document that already exists, including dotted OID keys, see Add Metadata to an Existing PDF.