Webxopt has extensive experience working with WordPress REST API and developing systems that use REST based JSON data.
Part of this development has been the the design of a central data repository which is then used to feed other sites, both internationally and external clients. This means that any change to the central data repository is instantly transferred to all other sites that use the data feed.
The data is also broken down into usable chunks that can be ‘mixed-and-matched’ as appropriate on the receiving site. Some sites may therefore choose to use just a product data table and image where other sites might use more off the data.
One of the great things about this system is not only that you can centralise data into the REST feed, but it is also quick! If designed correctly you will more than likely see your site loading time improve. This is because you are loading data in parallel and leaving WordPress to just build the page.