I have a project I'm working on with a team but I d like to put some details on certain cards without allowing all to see .
In Trello, it's not possible to hide certain cards or the details of certain cards on a shared board depending on the user.
What you can do is create mirror copies of certain cards on another board, and sync them with third-party tools such as CardSync or Butler for Trello.
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JIRA doesn't do field security like that. If you can see an issue, you can see all of it. You can restrict comments one by one, but that's the only thing you can hide.
Please, note this question was posted in the Trello product forum, not JIRA.