Xcode 27.2 adds JSON-based .xcproj project format

Apple's Xcode 27.2 now supports a JSON-based project format (.xcproj) that is more readable, merge-friendly and easier for coding agents to edit. It is enabled in the file inspector, projects open in earlier Xcode 27 versions, and Apple published a Swift library and CLI on GitHub for manipulating the format.

• The .xcproj format is enabled in the Xcode 27.2 file inspector
• Projects using .xcproj also open in earlier versions of Xcode 27
• Apple released a Swift library and CLI on GitHub for the format
• Developers had long asked for a friendlier format than .pbxproj