The Entity Share module allows to share entities using the JSON:API module (now in Drupal Core). It provides a UI to use the endpoints provided by the JSON:API module.
You can define one website as a "server" and another website as a "client". A website can be both "client" and "server".
Currently you can only, on the client website, get content exposed from the server website. You can't push content from the client website to the server website.
When pulling content, referenced entities are also pulled recursively. If you reselect a content it will be updated and referenced entities will also be updated recursively.
The entities you want to share must have the same structure (machine name, field machine name and storage) across the different websites.
Installation and configuration steps.
How to configure some authorization plugins
List of supported and not supported field types.
Documentation for non out-of-the box features, behaviors and regularly encountered problems.
Hints to resolve some problematic situations.
Special setup to synchronize Entity subqueue entities
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