Project metadata and the default page size. Every key is optional; a missing key uses its default.

{
  "version": 1,
  "name": "Product Info Sheet",
  "description": "One-page info sheet for a single catalog item.",
  "notes": "Markdown shown on the library page.",
  "categories": ["retail"],
  "page": { "width": 215.9, "height": 279.4, "background_color": "#FFFFFF" }
}
Key Meaning
name The project's display name.
description A short plain-text subtitle.
notes Markdown, shown on the project's online library page.
categories List of category names.
page Default width and height (mm) and background_color for addPage() calls that don't set their own. Default: Letter, white.