@id (node identifier) — The @id in JSON-LD gives an item a unique, stable identifier, usually a web address such as the business’s home page followed by a fragment like #organization. It lets other blocks and pages refer to the same entity without repeating its details. It is the closest thing Schema.org has to an official entity identifier. Keeping @id stable across a website ties all its structured data to one business.

Added October 21, 2026