Is there a way (kind of best practice or tool) to import Users from a custom CMS into Drupal (with of course the all fields already set)? I think a JSON object with my all Users' data is the only way. Passwords are actually strings encrypted in md5 so all passwords should be regenerated by the Users (that's not a big problem). Someone suggested JSONdata.com but the URL is not reachable.
Thanks in advance for all welcome suggestions/remarks.