Apple publishes a Swift library for reading and writing the JSON-based Xcode project format

Sources: primary, commit feed
Summary: The repository sits under Apple's GitHub organisation and describes a Swift package that models the JSON-based Xcode project format and both reads and writes it. The stated goal is to give tools one maintained model of the format rather than each reimplementing it. The commit feed holds a single entry, Initial Commit, dated 2026-09-16T21:54:41Z, which is what makes the package a story for this date. The page establishes nothing about when the JSON-based format itself appeared or which Xcode release introduced it.
Why it matters: Project generators, linters and validators have each reverse engineered the Xcode project file for years, and the stated goal of this package is to replace that with one model Apple maintains.
Follow-up: Track a tagged release, a stated API stability level, and whether Apple documents the format itself rather than only the library.