Belated welcome to the Atlassian developer community @JeevanKumarChamarthi,
And for the benefit of @lostpradise @JosefMoser, there is a recent announcement about Create Issue Meta Endpoint Deprecation where one of the replacement endpoints does perform “issue types by project”:
- Get create metadata issue types for a project: fetches all Issue Types for a specific Project; it will support pagination on the Issue Types, but not include expanded fields.
Specific to @JeevanKumarChamarthi’s question about JRJC, I hope you aren’t using that with Jira Cloud. It looks clear to me that library is being maintained for Server/DC but not for Cloud.