Content Dump

content_dump provides a drush command to dump all of the content to a serialization format (by default this is XML or JSON but any that are available can be used)

This allows a site to be entirely exported in a way that is readable by third-party systems while maintaining the structure of the content. While it may be possible to get most of this information by the jsonapi that may not be practical for larger sites.

To use enable the module then type drush cda will export the data.
By default, users are excluded from the dump but you can include them by specifying users in a list of types to export with the --types parameter.

If you are looking to export from one Drupal site to import into another then look at content sync this module is aimed at allowing a large archive to be passed to a non drupal system in a format that suits it.